It's confusing at first. Just go down to where you see a list, b list and c list side by side, then click on a list and it will let you pick those drivers, then do the same for b and c lists, then click set roster to confirm when you're done. Also, next week will be confusing, so let me tell you now. To pick different drivers, you first have to reclick a driver from the prior week. Reclicking actually unselects that driver and will allow you to pick someone else.