How do you add players in Halo Infinite?

To add friends in Halo Infinite, one must navigate to the Social menu, accessible via the main menu or the pause screen during gameplay. Inside the Social menu, there's a 'Find Friends' feature where one can search for other players by their Xbox Live Gamertag. After locating the desired player, send them a friend request. Once the request is accepted, one can invite newly added friends to their Fireteam by selecting their name from the Roster and choosing 'Invite to Fireteam.' This integrates smoothly with cross-platform play, so whether one's friends are on Xbox or PC, they can join the same game session given that crossplay is enabled.