So as the forum continues to have issues all day I notice that the sluggishness and the lack of patience by some members have actually made one to post a particular reply twice.
You got your question answered, so I'm not going to try to restate it but I just started browsing the forum a few minutes ago and yours was the first thread that caught my eye--so what problems are we having today and why are people trying to reply twice in a given thread?
You can always delete any of your post anytime. The only board that you can delete or edit your post is on Archival.
"Anytime" doesn't necessarily mean "immediately" though, because as was pointed out you can't immediately delete a post in certain sections. Dr.Bitcoin_Strange mentioned campaign threads, but I also seem to recall it's true in auction threads as well (but I could be wrong, and to the point of OP's concern it probably doesn't matter much).
Edit: LOL, I just had to delete duplicate posts so I see what's going on here very clearly. Jeez.