Apple TV remote

Find out which Apple TV remote you have.

If you need to pair or unpair your Apple Remote (aluminum or white).

For a Black Siri Remote:

Point your remote three inches away from your Apple TV. Then press and hold your remote's Menu and Volume Up buttons for five seconds. If asked, place your remote on top of Apple TV to complete pairing.

If your Apple TV remote isn’t working - Apple Support

I think you’re asking “how to do it”; if so:

https://support.apple.com/en-au/guide/tv/atvbc9953e63/tvos