Hello. I too came across this same issue with wheels I currently have for sale on this section of the board (I.e. the "Edit" button was no longer available for my original post).I would like to edit my first post on my Forsale ad, is that not possible in anyway?
There were no replies from other members to my for sale thread, so I simply replied to my own thread using the "Quote" button, and added a "Title" to my reply stating "Updated Information and Pics" (as an example). In the reply, I listed my "edited" information (i.e. I updated some information contained in my initial post directly above, and added some pictures to the listing as well).
I hope this information is somewhat helpful.