To remove a pilot/user from your list of active pilots, go to the Admin | User Mgmt and select the user. Once the user is selected, click the status tab. There you will find a link for retiring the user. (Users can not be removed - only retired or suspended.) Before you retire a user, consider using the link to cancel that user's future schedules.
If you need to remove several inactive users (that have not scheduled recently), you may want to use the 'Bulk Retire' function, which is Admin | User Mgmt | Retire/Suspend.
Note: Do not reuse accounts, since reports and historical data tracks the user #. Instead, retire inactive users and assign new spare users as needed. We do not charge for retired or inactive users.