Leaving time-stamped comments.
To leave a time-stamped comment for your engineer on your project, simply click and drag on the region of the waveform where you wish to leave the comment and then type in your comment. You can leave multiple time-stamped comments. 
You will see these comments populate under the project with the time stamps. Once you are done with all of your comments click 'Request Revision' and the time-stamped comments will be sent to your engineer to review and edit.