How to use a wireless keyboard with Apple TV
How can I use my wireless keyboard with my Apple TV?
How can I use my wireless keyboard with my Apple TV?
What generation ATV do you have? The ATV4 (current model) does not currently support keyboards. You would need to use the remote app instead...
but if you have the ATV 2/3 Use an Apple Wireless Keyboard with your Apple TV (2nd or 3rd generation) - Apple Support
How to use a wireless keyboard with Apple TV