Ok, there are a few things that might be wrong. I messed up with it the first time I tried too. First, follow these guidlines:
1st: Enter the Poll Question (e.g "Which Howl Do You Like Better?")
2nd: Enter a Poll Option (e.g Scamp's) and press Add Option. The screen will refresh and another blank Poll Option box will be under the first. Put your second question there (e.g Jenna's) and press the Add Option button again. Add more questions if you want.
3rd: Enter the amount of days it should be displayed or leave it blank
4th: Send the post!
I think that if you follow those guidlines it should work. What most likely happened was that when you entered the second Poll Option, you didn't press the Add Option button again. Here's what my example poll would look like:
Which Howl do you like better?
*Scamp's
*Jenna's
Sorry if it doesn't help, but that's the best I could do
