Fictional Fans

Good question! I've never tried so I had no idea, but luckily my personal paid account just expired today because I'm bad at remembering things, so I could test.

I think you need to go in through "post entry" on the community's profile page or from one of the links while you're on the community's journal page. If you use your usual post entry page the option isn't there even if you select "post to" the community. If you do go in through the right link, you should see a link to either "create poll" or "poll creator" up above the entry page (depending on which posting form style you use.)

If you click that, you get an error page that says your account type can't do polls, but there is also a "switch" button on the error page, and if you click the switch button, it reloads and the poll creator form comes up, and it let me post a test poll from there. I don't know why that works, but it seems to.

If that doesn't work, let me know and I can try some more testing.