Well, you'd hope that because you can mark a thread with "Question:"
when you very first make it, that you, the original poster would be able to mark with resolved when hitting Reply, but it seems not so
Also ,you cannot edit your Question to Resolved
So the only way for we, lowly peons, to mark a thread as Resolved is to choose "Resolved" when we first create the thread.
Rather silly/pointless and I can see why a lot of people dont bother with that Question/HowTo/Resolved/Whatever combo