You're talking to a guy who would prefer it if we still used quills and inkpots. When you say stuff like "edit in paint" I have not the foggiest notion of what you're talking about.
Well, Right click on the image, click
Save Image As... and save it on the desktop (or wherever you want it saved). Then right click on the image on the desktop and you should have an option to
Edit, which will open it in MS Paint (A rather basic image editing program), or
Open With which should offer the option of using MS Paint.
If you make an error in Paint, just click
Edit then
Undo. If you want to start over entirely, just exit the program and open the image up again, and the changes you made shouldn't appear unless you've clicked
File and
Save or
Save as...
Of course, this is all operating on the assumption you are using some form of Windows.