Usrer Polls?

If you aren’t able to do this in wp-polls (first glance tells me that you won’t), you can go through the plugin directory. I would recommend the following search as it lists the most heavily used first (though it also lists some non-polling plugins, too): https://www.ads-software.com/plugins/search.php?q=poll&sort=popular

First one I could see that looked like it would do what you want is this: https://www.ads-software.com/plugins/polldaddy/

Though it does use an external free service, which each contributor would have to sign up for.

Polldaddy doesn’t have that feature, or any other polls plugin !

I have tried this code but it won’t work for me:
https://www.ads-software.com/support/topic/plugin-wp-polls-only-administrators-can-add-polls?replies=5

Please, any help?

ditto for me too, cant find one which allows subscribers to create a poll