Ask HN: How do I create a poll on HN?

A question: You've been on HN for about 4 months, so you probably know about karma and upvoting. Indeed, two weeks ago you asked about karma and had various points explained.

I can understand why you might not know how to create a poll, and hence your question here.

What I don't understand is this. Someone has taken the time to answer your question - quite promptly - and clearly you read their answer because you created a poll fairly soon thereafter.

Why did you not upvote them?