Follow these steps to add a tumblr poll to your tumblr post/page:
1) Create a poll using the create a poll form.
2) After the poll is created, locate the poll you created in the Dashboard.
4) From your Tumblr account dashboard, click on the posting option labeled “text.”
5) Click on the gear symbol in the upper corner.
6) Under “Text Editor” select “HTML”
Your done, the Opinion Stage poll was added to your site!
For an example of a Tumblr blog using Opinion Stage polls click here: http://opinionstage.tumblr.com/