Exactly the same as a single player run, except that you put the second player’s name in the appropriate field.

To add to the above post, you can only submit multiple player runs (duo, trio, etc) in certain categories of certain games. If a game only accepts single runs but you think there should be a category for duo runs, message a game moderator.

Also, please make sure you put the same names in the 1P and 2P box each and every time. Otherwise it leads to messed up leaderboards with the same pairing in it twice due to switching the names around (either accidentally or nefariously).

@ckellyedits Unless player one and player two have different roles, which is the reason why swapping the names can be considered separately in the first place.