Quote Originally Posted by Yutilk View Post
how to add a comment on the sheet?
The link in the Original Post at the top of this thread opens up the spreadsheet in a way that allows you to put comments. On the first tab named 'Intro' there is an example of what a comment looks like. Comments added stay until they are resolved. I think all you need to do is right click on the relevant cell to add a comment (or you can use the Control-Alt-M shortcut).

Note that the link in the 2nd post was added back when the volumes were so high that the 1st spreadsheet link was already maxed out (could only have 100 concurrent users) so I added the 2nd link... I think this 2nd link may not allow comments (not 100% sure) so I would only use the 2nd link if the 1st one is maxed out (over 100 users at once)...