You can add polls to your site by copying and pasting the embed code of the poll into the HTML Code Widget in Yola. To find a poll that you might like to use, do a search on Google for "free polls" or "create online poll". 

Here is one you might like to try: polldaddy.com. When you have created your poll, copy the HTML embed code they provide. Then, in the Sitebuilder:

1. Go to Widgets > Popular.
2. Drag and drop the HTML Code Widget onto your page.
3. Paste the HTML embed code for your poll into the HTML Editor.
4. Click "Save".
5. Your poll will then be embedded in your page.