you can make as many moves as you want with your team on a daily basis, just hit submit changes on each day. you only get 4 add/drops per week, starting monday morning, and i believe you can trade as much as you want. add/drops usually don't get picked up until 2 days later.
MusketeerX just stole Andrew Bogut under my nose, he's got quick computer hands! i have a feeling he is back in the game!