How can I find comments which the review editors have suggested a revision?

In the author dashboard, click on the "RE Revisions" menu tile to open comments which have been returned back by the RE suggesting a revision. The number of pending comments for your chapter is displayed on the tile for notification. 

Once, you navigate to the page, select the chapter from the drop down and click Search to retrieve all comments from the RE

Authors can respond to the RE comment and update the response by following the same steps as involved in responding to comments.