• How to edit a published solution?

I want to edit a published solution (just to fix a comment), but I can't figure out how to do it.

For one thing, I can't figure out how to get back to the page that shows an [Edit] button for that solution, although I have seen such a page before. But more importantly, when I do click on such an [Edit] button, the code in the page that comes up is not actually editable, as far as I can tell. (I think the title of the solution may be editable, but I don't remember for sure.)

Is possible to edit a solution after it is published? If so, could someone show me how to get to an editable version of the solution linked above?

(In the past, I resorted to removing a published solution, and posting an edited version of it, but this cost me the only vote I ever got. At the time I did this I did not realize that I'd have such a hard time getting votes, nor that votes are tied to individual published versions, and not to their authors. So deleting my lone voted-on solution was a really dumb mistake. I want to find a better way to edit a published solution.)