Use comments to add your feedback or ideas to a presentation. Attach comments to a letter or word on a slide, to a graphic or other object, or to a whole slide.

Add a comment

1. On the slide, click the text or object that you want to add a comment to, or click anywhere on the slide to add a general comment.
2. Click Review > Comments > New Comment. This opens the Comments Pane at the side of the slide pane, and places an orange active comment icon next to the element that the comment is about.
3. Type your comments in the text entry box. To finish, click outside the comment box or press the Tab key.

If the Comments Pane is already open, you can click New Comment to add a comment to the text, object or slide that is selected. You can attach multiple comments to the same text or object this way.

Note: 

• Elements that have comments are indicated by a comment icon. Click the icon to see the comments about that element in the Comments Pane.
• To move between comments, click the up or down arrow at the top of the Comments Pane.

Edit or reply to a comment

Use the Comments Pane to reply to comments added by other reviewers, or edit them.

To edit a comment: Click the text of the comment that you want to edit. This opens a text entry box with the comment in it. Make the changes that you want, then click outside the comment box to finish.

To reply to a comment: In the comment that you want to reply to, click Reply. Type your reply in the text entry box, then press the Tab key to finish.

Delete a comment

On the slide: Right-click the comment icon of the comment that you want to delete, and then clickDelete Comment.

In the Comments Pane: Click the comment that you want to delete, and then click the black X.

Source: Microsoft