On mouseover of a review, you have the option to create a reply on the review with comments by clicking the 
icon.
Respond to the review comment as needed. You can type '@' to mention a project member in your reply and select their name from the suggested dropdown list. Enter the initial characters to filter the options appropriately.
(Attachment) icon - Click to attach external files from your computer. A layered page allows you to select and upload files from your local device storage.
(Association) icon - Click the 'Association' icon to view association options, which include 'Associate Files', 'Associate Reviews' and 'Associate Apps'.Associate Files - Click to associate documents with this review comment. A layered page populates, displaying the files you can select to associate with the review comment being created.
Associate Reviews - Click to associate other review comments with this review comment. A layered page populates, displaying the file review comments you can select to associate with the review comment being created.
Associate Apps - Click the 'Associate Apps' option to associate forms with this review comment. A layered page populates, displaying the forms you can select to associate with the review comment being created.
Associate Markups - Click to associate markups to this review comment. A layered page populates, displaying the markups you can select to associate with the review comment being created.
(Show Toolbar) icon - Click to view the toolbar with rich text options that you can use while creating the review comment. The rich text options appear as a top bar in the comment box.
(Save) icon - Click to save the review comment you entered.
Next Article: Mark Review as Private