I am also new to the game, 2 weeks or so, but i think u can use resign position, and switch teams, but dont kno if its available during playoffs, but it is available to switch teams during the regular seasons for sure.
How ?? Because when i customize my season before starting, i can change the teams of conference or division but i can't retire a team for starting the season. I will want to do a season with only 18 or 24 teams , is it possible , and how ?? Thanks