if you look under your schedules there should be a manage your schedules button and then you can remove lessons there, for adding lessons it might be there or go to community lists in resources there you can add/make scheduals. hope this helps=D
If you want to arrange the order they appear, then tap "rearrange my dashboard", then under the schedule shortcuts section, there is a way to order them there.
For adding/removing, the above poster is correct :)
