Well, when you make a thread, write your message as usual, but when you are done, do not click Submit Message. Instead, scroll down and it will say something like this:
Post a Poll
Yes, post a poll with this thread
Number of poll options: (Maximum: 12)
Check the Yes Post a poll with this thread box. Then click the number of poll options ( How many things to choose from ) Now click submit message and a new window should come up. Fill in the choices. If you want to allow people to check more than one box, check the " Allow People to choose more than 1 option" box. If you only want them to choose 1 choice, dont click the box. And you're poll should appear after continuing. You can test it over at the Test Board, located here