If you have made type-errors (like me) or you found an information you will add to your answer later you can go back to your comment and click on the triangle right beside "Add comment". Click on >edit post< and you are able to make changes the text or add a link or a pic. After that you click on "save changes" and then there is a writing that the text was edited :o)
So it means that you have edited your answer...but, how do you do that?
I actually did edit a posting of mine a while back. But I can't remember how it showed up. I believe it showed up when making a posting.
When you have submitted your comment it says "edit" in blue by the side of your name. Click on it and do just that!
Click on the arrow beside "Add Comment" and you will see 2 choices. Edit this post and Report abuse. click on Edit and it puts you back in the original answer you have given.;)
The Edit in blue that Sue is referring to would be a comment under a comment. ;)