There is not supposed to be a post new poll button. Once you install it go to your control panel and choose "General Display Options", near the bottom you can select who can post polls. When you click the new topic button, if you can post a poll (if the who can post option is set to all members, then all members see this), you will see at the bottom of the new topic form, a checkbox that has "Post Poll?" next to it, and an input box for number of options you want your poll to have. Check the box and put in some number (like 3 or something) for the number of options, then fill in the rest of your post (topic, message, etc) as normal. when you click Add New Topic, it will take you to a page that lets you set up your poll with the number of options you selected. Then when you submit that page, your post will be made and your poll created.
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