I don't see where you tried to make a poll. I had to play with this a bit to do this myself. When you make a new topic you need to click on the option for Manage this topics poll. The post above had good instructions.
To add a poll to a reply.
Click Add reply
Then Click here to manage this topic's poll
Then Type in your Poll Title - I put "Can you make a poll?"
Then under Poll content you will see Add Poll Question, Type your question there
I put "I can make a poll but can you?"
Then Add poll choice
I typed Yes
Then Add poll choice
I typed No
Then I clicked Close Poll forum
Play around with this. I am sure you can figure it out.