Comments are most likely going to be your most often used markup tool in Adobe. There are a handful of different ways to add a comment. To access them, first click the Comment tab. You can click the little bubble up here under Quick Tools; it is one of the first tools there by default, because it's so often used.
Select that tool and go to anywhere that you would like to on the document and click. Then you can add whatever comment you like, such as "Great opening line!" The thought bubble icon  will stay on the page as an indicator, and the comment box is called a pop-up . You can close the pop-up by clicking the close box in the upper right corner, and you can reveal it again by double-clicking the in-page icon. If you hover over the icon, you can see the contents of the pop-up. When you right-click a comment it will open a sub menu with several other options, including Reply, Delete, etc. And finally, if you single click on a comment, you’ll see a four-way arrow icon. If you see that, you can move the comment to another place in the document.
As you add comment and annotations, you'll see them appear in this dropdown list down here called the Comments List . You can double-click one of these entries in the Comments List and that corresponding comment gets highlighted on the page.
The Text Annotation tools are all available in the Annotations Panel (shown below).We'll go through each one and discuss its usefulness as a digital editing tool.
Highlighted text is one of the more basic annotation tools, and it does exactly what it says: it gives the appearance of highlighter marks on selected sections of text.
To highlight words in a PDF, choose the highlighter icon:
In the document, select the text you wish to highlight. When you release the mouse, the selected text will be highlighted in yellow:
If you want to make a note, double-click the highlighted text to reveal the pop-up note associated with the text.
As an author of a document, it’s common to include reference links to additional content stored in other documents or on the Web. As a reviewer, you can refer the author or other reviewers to additional information by attaching files, such as documents, worksheets, HTML files, Flash video, SWF files, or MP3 audio clips to the PDF. You can attach any file type to the PDF, but the author or reviewer must have the correct application used to open and view the file.
The two icons look like a Paperclip (for text based documents) and a Speaker (for audio and video files)
To attach, click the Attach File tool; either the Paperclip or Speaker icon. Position the mouse pointer in the PDF document where you want to attach the file. Click in the PDF document where you want to place the attached file.
The Add Attachment dialog box appears.Browse to locate a file to attach. Select it and click Open.
To view the attached file, double-click the attachment icon. You may see a message appear, warning you that opening attachments has risks, including viruses that may infect your computer. As long as you trust the source of the file, select Open This File, and click OK.
As long as you have the appropriate application, the file will open in a new window.
Text Markup Tools
There are four text markup tools at your disposal: insert, delete and replace, delete, and underline. Review the information below to learn about each:
If you'd select this tool and then click in between a couple of words, a pop-up automatically appears, and you can write whatever it is that should be inserted. It’s essentially marking up a paper with proofreader's marks where you add an upward pointing chevron to say add this text right at this point.
Delete and Replace
say that you don't like a word in your document and want to change it to something else. With the Delete and Replace tool, select any text in your document. Automatically the pop-up appears, where you can write in what you would prefer to say. When the recipient gets it, they see a cross out with the little insertion mark.
To mark text as deleted, all you need to do is drag over it, and it automatically becomes crossed out.
Select text to underline.
Some of these annotations, they can replace each other. I could have used a sticky note for most of these annotations, but a great advantage of using the real text annotation ones is so that the recipient knows exactly what it is that you're talking about, or where exactly to insert something.
When you are exchanging documents repeatedly or using multiple reviewers, consider using the stamp tools. Reviewers can use stamp tools to mark the document with a graphic that denotes the document’s status. Users may also use this tool to mark a document as a draft. Multiple reviewers can stamp a document, providing a clear history of the review process. You can even create your own stamps, if none of the presets met your stamping needs.
If you click to show the Stamps palette (below), you’ll get a pop out box that can stand on its own while you annotate. There is a dropdown list, and you can see all kinds of useful stamps. These are exactly the kind of like little sticky notes that you can buy from an office supply store and hang off of a piece of paper. Dynamic stamps are ones that automatically include your username and time as you stamp with them.
- To add a preset stamp click the Add Stamp tool from the Annotation Page to open the pop-up menu, and then click Dynamic, or Sign Here, or Standard Business.
- Choose the appropriate stamp from the submenu.
- Your chosen stamp appears in a faded-out color and moves with your cursor.
- Click on the page where you want the stamp to appear.
- To edit or delete a stamp, click on it and transform handles appear along the border of the stamp.
To attach a pop-up note to a Dynamic or Standard Business stamp, right-click and select Open Pop-Up Note or simply double-click the stamp. Type the desired text into the pop-up.