When you go to make a thread if you scroll the the bottom, below the submit, there is an "Additonal options" section.
The last thing on the options is "post a poll" And you want to select the small button under there, and put in the number box how many options/answers you want your poll to have.
Once you hit submit it will load a new page where you make your poll and you'll be able to enter your answers and question title as well as select if you want answers public and/or multiple choices. And there is a thing that asks how long you'd like it open and you can make a deadline, or leave it as zero for the poll to never close.