Go to edit the deck -> click the deck name -> click the drop down where it says standard -> change to "Friendly Brawl" -> put a commander in the command zone -> Go to friend challenge -> send a challenge, setting the second slider from the top to "Friendly Brawl"
Go to edit the deck -> click the deck name -> click the drop down where it says standard -> change to "Friendly Brawl" -> put a commander in the command zone -> Go to friend challenge -> send a challenge, setting the second slider from the top to "Friendly Brawl"