How do I swap/change athletes at a particular position in a drill?

To swap athletes in a drill:

1. Select desired drill.
2. Assign 2 or more athletes to a position for swapping. The first assigned athlete will go first and won’t be automatically swapped out.
3. Press “Start Drill.” 
4. Run as many reps as desired.
5. When you wish to swap athletes, press “Change” in the top left hand corner of the screen.
6. Select the athlete to swap in from those listed under “On deck,” available athletes not currently performing the drill. You can swap athletes as many times as desired within a certain drill.
7. Press “Confirm” and wait for “Begin Rep” to illuminate blue before running a rep.