Go to create your thread, write whatever you want and before you click 'create new thread' check the 'create a poll' option. On the next page you'll be able to make the poll.
Does anybody know how to set up a poll, thread tools method doesn't seem to work on the TSR website.
Is this a thread that you've created and if so, is it recent? If it's an old thread, you may not be able to do so. If you're still having trouble. post in Ask A Moderator with details of what you'd like set up and the moderation team can help you.