Here's a link to the FAQ on Polls.
http://www.championsofregnum.com/for...#faq_vb3_polls
Basically, after you click submit new thread, you'll be able to edit the details of the poll.
Once you click submit new thread, your thread will be posted to forums but without a poll, so try to complete the poll within a reasonable timeframe. It's a fairly straightforward thing to do, just fill out the question and the options.
If you feel like testing it, just post in Portugese section of forums. Nobody cares about them.