It tells me I have 15 min, but I can't seem to figure out how to do it. Am I supposed to be able to click on the pencil graphic? Maybe it's because I am using Firefox?
The way it works for me is I just place the cusor over the text (the background turns yellow) and click. The text is placed in an editing box just like when you first enter your comments and when you're finished, click on 'Save.'