I'm on PS2 so I'm not sure what the button is on xbox, but, once you get ready to play your selected game during franchise, at the team selection menu, hit the button that brings up the quarter length, home and away playbooks, etc. (Its "O" on the PS2)...Find your team and scroll down the playbooks til you find your custom playbook. Should be the one right before the 49ers book if you scroll backwards, ie. right after the Vikings. Exit out and start your game and you should have your custom playbook.