Type out the message as you would normally. Then scroll down a bit and select the option for creating a poll...and enter the number of options you want your poll to have. Then hit the "Submit Reply" button. It will then refresh into a new page with the form you fill out for your poll. You fill out the title for your poll...fill in the selections you want members to choose from....and select whatever options you want (ie: allow multiple votes or make the poll public meaning others can see who voted for which)....then click "Submit" again.

A hint when creating polls...have all the info you want to fill in for the poll already planned out. Because your thread will post immediately and will be sitting there without a poll for however long it takes you to fill out the poll form. So the quicker you can get that filled out, the less chance you have of confusing someone.