You can create a post in your Community in the following steps:
1. Click on the Commerce tab on the left side bar.
2. Click on Community.
3. Click on the Community you want to create a poll in.
4. Click on the blue + sign on the top right in the comments box.
5. Type in your poll question.
6. Click on the bar graph icon below.
7. The poll opens up and then enter in your options.
8. Select your poll duration.
9. Watch the video for more information.