You're unchecking the wrong thing. Gotta register bro. Uncheck the 'optional' line.

Using this celebrity entrant as example.

KEEP THIS REGISTRATION LINE CHECKED:
FORC Frozen Fat Fondo Fest Registration for Barack Obama (460431)
02/07/2015 Solo Women $20.00 remove

UNCHECK THIS ONE DAY LICENSE LINE (unless you choose to buy it)
(Optional) Mtn One-day License on 02/07/2015 for Barack Obama (460431)
Optional for riders without an active annual license for Gran Fondo Events. $15.00 remove