Only mods can. Heres what I got from the " HELP" section.
Quote:
How do I create and vote in polls?(only Mods can add polls)
Creating new poll works just like posting messages. By clicking on , a pop-up window will appear and you can enter your Poll Question and vote choices in it. If you would like to create a poll that allows multiple selection (checkbox instead of radio button), check the "Allow Multiple Selection?" box. Enter the poll choices below the message body text box.
Once the poll is submitted, members will be able to vote, view result, edit poll, or even strip poll (some of these options only applies to the poll creator and the forum moderators). There are many options provided when editing your poll. You can change your poll question, add/edit/delete poll choices, and change multiple selections to single poll selection, etc.
How to post a poll
Heres what I got from the 
