1. Go to Blogger Dashboard.
2. Click on your Blog Title.
3. Jump to Layout tab from left navigation pane.
4. Click on an Add a Gadget link.
5. Now scroll down and click on Poll element at gadget list.
6. Now you will prompt to enter your poll question and possible answers.
* If you wanna add more answers, you can click on Add another answer link.
* Also you can let visitors to select multiple answers by selecting Allow visitors to select multiple answers option.
* By default, your poll is set to run for 7 days. You can change poll closing date and time if you prefer.
7. Now save your poll element.
8. Arrange your element on your blog layout and click Save arrangement button to save changes.