Board Thread:Support Requests - Getting Technical/@comment-38739102-20191220225728/@comment-34888194-20191221135839

Jade's response only works if you are an admin or discussion mod. Otherwise, you can ping them in their wall for deletion if you desire. Once polls created, it can never be edited by anyone, to prevent cheats and false votes.

I don't see how editing discussion post has anything to do with this. The OP wanted to know about deletion of a poll in discussions.