Click on the little envelope by your name at the top of the page. This is your statistics. Click on the tab that says This Month or whatever the largest time frame they give you. (Mine is months, but I have been here less than one month.) To the right there will be tabs. You can click on the Revisions tab, or the Responses tab to find these things.

I just read the explanation. A way to get there from the thread, is while in the question, There is a place below the question and tags that shows who asked the question and the date and if it has been edited, there is a place that says Edited and the date it was edited. The date is a link you can click on to see past editions and edits.