Click on the More button at the bottom of the screen.Select Friends (the current total of requests is displayed to the right).From there, tap Requests.Tap either Accept or Decline.
To add friends on Roblox Xbox, first open the Friends app. Then, select the friend you want to add and press the A button on your controller. If you’re not already friends with the person, you’ll be prompted to send them a friend request. See also How Much Does The Xbox Series X Weight?