Follow these steps to add a Tumblr poll to your Tumblr post/page:
1) Create a poll using the Create a Poll form.
2) 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 right corner.
6) Under “Text Editor” select “HTML”
You’re done, the Opinion Stage poll was added to your site!