I have had a few problems with my extra chances and logging in correctly, but steve sullivan helped me through those by email. He responded within hours and was very helpful. The system is not to hard, just make sure you get someone to log on and make a user profile so you can list them as your potential alternate trip leader. They must log back on and confirm their status after you list them on your trip.
The lottery is going to happen oct 23, so get busy!