You will first select the Passion and Matchup format (Singles, Doubles, 2 on 2, 5-a-side, etc). Matchup formats are different for different sports. Matchup formats involving team sports will also require you to be part of a Team sport group with that Passion.
You will then pick the Matchup’s Playground venue and opponent player / team. The final step is to confirm on the date & time for this Matchup. A Matchup invitation will be sent to other party to accept or reject.