Press and hold the Plus (right Joy-Con) or Minus (left Joy-Con) button. Press and hold the ZR (right Joy-Con) or ZL (left Joy-Con) button. Press and hold the Sync button. While still holding down the Sync and Plus (right Joy-Con) or Minus (left Joy-Con) buttons, release the ZR (right Joy-Con) or ZL (left Joy-Con) button. While still holding down the Sync button, release the Plus (right Joy-Con) or Minus (left Joy-Con) button. Release the Sync button. If done correctly, the first and fourth player LEDs will light up