When you first signed into your account, you entered positions and helpers. You can always add more positions or change your positions and set which helpers can be scheduled for them.
After adding positions, in the Positions Grid you can set which helpers can be scheduled for these new positions: More
EDIT Positions (jobs) to change the way the position label/name displays on all schedules
DELETE Positions (jobs) if you make a mistake and enter an unnecessary position you want to completely remove