Launch the game on Roblox. Click the Friends icon on the right side of the screen. Scroll down to the codes option. A pop-up to enter the codes will appear on the screen. Type any working code in ...

It's a little bit more straightforward to add a player on the ROBLOX Player. At the top of the home screen, you'll see "Friends" and then a circle, that has an icon of two players, saying Add Friends.