If the administrator hasn't deactivated the function to create polls, you will find the poll form below every post form when you start a new thread.
Polls can be edited as long as no one has voted and the poll hasn't timed out.
Can I edit my own posts?
Yes, just click on the 'Edit' button in the post that you want to edit. Usually normal users can only edit their own posts. The administrator can also deactivate the edit option.
Can I delete my own posts?
Yes, just click on the 'Delete' button in the post that you want to delete. Usually normal users can only delete their own posts. The administrator can also deactivate the delete option.