Use comments when you want people to review and provide feedback on a presentation that you created, or when colleagues ask for your feedback on a presentation. A comment is a note that you can attach to a letter or word on a slide, or to an entire slide.
Add a comment
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Select Review > New Comment. Or select New if the Comments pane is open.
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In the Comments pane, type your message in the box and press Enter.
View and reply to comments
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Select the comment icon
on the slide.The Comments pane will open and you can see comments for that slide.
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Select Reply to respond to a comment.
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Select the Next or Back buttons to go between comments and slides.
Delete a comment
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In the Comments pane, select the comment you want to delete and select the X.
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On the slide, right-click the comment icon
and select Delete Comment.
Source: Microsoft