After you select the text (or anything else in the document) where you want to insert a comment, open the Insert menu and select Comment.
Type your comments in the bubble (in Print Layout view; in Normal view you must type into the Reviewing pane). Click anywhere in the document when finished.
INTRODUCTION
When working in a document, you might find that you need to add a note in your document to remind yourself to check on something or to verify some information when you work on the document later. Instead of adding the note directly into the text, you can add a comment.
TIP
Editing a Comment
You can edit your comments by selecting the highlighted area of the comment or the comment bubble with the mouse, right-clicking, and selecting Edit Comment from the shortcut menu that appears. Then, make any changes you want.
Deselect the Comments option from the Show menu on the Reviewing toolbar to hide your comments (open the View menu and select Reviewing if it's not displayed).
The comment is hidden. (Only the checked items on the Show menu appear in the document.)
TIP
Deleting a Comment
You can delete a comment by selecting the highlighted area of a comment or the comment bubble with the mouse, right-clicking, and selecting Delete Comment from the shortcut menu that appears.