To perform a live-on-live session, you must first choose the Multiplayer setting in the Diamond App. To do this, follow these steps: Play Screen>Multiplayer>select all the pitchers and hitters you wish to record data with>Select a Live-on-Live session classification From here, you will be able to drag and drop players into a Hitters or Pitchers list for the session. Players that are only listed as Pitchers or Hitters will auto populate into the corresponding column. Once you start the session, you will be able to tap on the left and right arrows of both the hitters and the pitchers to navigate between players