A poll card works like any other chat message when it comes to interacting with it.
Open the interaction menu
Long-press the poll card.
The same menu you'd see on any message appears, with options based on your role: Reply, React, Forward, and, if you're an admin, Pin to Chat and Delete.
Reply to a poll
Tap Reply from the menu. The Quick Reply bar activates with the poll's question shown as the reference, just like replying to a text message. Type your reply and send. Replying doesn't cast a vote, it's a separate comment linked to the poll.
React to a poll
Tap React to add an emoji reaction, using the same 5 quick emojis and full emoji picker you'd use to react to any message.
FAQ
Does replying to a poll count as voting?
No. Voting and replying are separate actions.