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It’s the white game controller icon with a blue or purple background. You’ll usually find it on the home screen. Servers are listed along the left side of the screen. It’s at the top of the screen next to the server’s name. You’ll want to create a separate channel that’s just for the poll to get the best results. This will be the name of the channel in the server list. You may want to call it something similar to the question you’re asking.  Go to the channel by tapping its name in the list. Tap the name of the channel at the top of the screen. Tap Permissions. Select @everyone. Enable all of the following: Read Messages, Read Message History, and Add Reactions. Click X next to the remaining permissions. Return to the channel when you’re finished. You’ll need to enter a question as well as instructions for voting. Here’s an example: Do you like pepperoni on your pizza? React with the smiley face if yes, or the angry face if not. Now that you’ve set up your question and given everyone the right permissions, type something into another channel (or send direct messages) to let everyone know about the poll. Once everyone has voted, you can easily tally the votes by counting the number of reactions.

Summary:
Open Discord. Tap the server you want to join. Tap ⋯. Tap Create channel. Type a name for the poll. Tap Create. Adjust permissions for the channel. Type your poll question into the channel. Tell people to vote.