I know it's a bit late and you might have already figured it out by yourself, but I thought it would be useful to leave this to people who don't know how to set up a poll. To set up a poll you first need to make your thread as there's no option to add it while creating a thread. Above the initial post of the thread, on the right, there's a small box with three points (...) on it. By clicking on it you will be able to edit the thread title and make a poll. Simple as that. I don't think you need privileges as I'm a relatively new member and I was able to do it easily. I think you can only do that during the first hours after you created the thread.