Board Thread:General Discussion/@comment-28036415-20160501175324/@comment-856287-20160501181231

Go to the page's history.

You can see your edit at the top of the list. On the end of that line, just click on "undo" and you'll be taken to an editor with the last revision in it. Click on "Publish" (sometimes "Save") and your change will be undone.

Whatever changes you were trying to make ("Supplemented and revised captions.") have been lost and will need to be redone.