Start a franchise or continue an existing one. Make sure the "GM Control" option is set to all teams. Go to the GM Office, then to "Trading Block". Select any player not from your team and put them on the trading block. Then, select "Get Offers" and make sure the other player involved is also not from your team. When you select the other player, the screen will change to the regular trading screen. The person on the trading block will be in your team's section. Go to "Submit Trade". When the message stating that the trade was accepted appears, you should have the player that was not on the block. The player on the block should be on his current team and the other team involved in the trade.