Team Maintenance points: These are what you need to have at the end of the season to finance the team. So say you bought Justin Marshall for 42 trade points next to it it says how many maintenance points he has. He may have 12 maintenance points, so you have to have 12 trade points left over at the end of the season to pay him. Think of it as wages.

Changing your line up (PC): (Based on original keyboard settings)

Press 's' to select the player you want to replace. Then press the down button until you land on the player you want to replace him. Press 's'. Change should be complete.