[RobM]

Members can delete their own threads, but not in your usergroup. You're still in the one-from-bottom usergroup so that option isn't enabled for you.

Contribute to the site (posts, comments etc) and you'll have those options enabled as you move up automatically.

You can report threads you want deleted but I wouldn't bother. We're not fussed about old threads and if nobody replied and it's already scrolled down the page it doesn't matter. It's unlikely anyones going to respond to a months old thread with no replies anyway.