How to pair firestick remote?

First, make sure your TV is turned on and that you are within 10 feet (3 meters) of it. Then, simply press and hold the Home button on your remote for ten seconds. The light at the top of your remote should begin to blink, followed by an on-screen confirmation that your remote has been linked.If neither appears, remove or replace the remote batteries and wait thirty seconds before attempting again. If it doesn't work, proceed to the next section for instructions on how to reset your Fire TV Stick remote. This could be done firestick remote stopped working

Learn also: https://feedingtrends.com/how-do-i-watch-twitch-on-roku