First you have to create the account on scheduler page. Once you created your account in scheduler page after that schedule your sessions and once you have scheduled your sessions then you have to click on user portal and create your account again. Once you have done new membership on user portal you will get one email with userid and pass from that userid and pass login to your user portal and there you will find the userid/pass to access your rack.
SCHEDULER : - ACCOUNT is only to see the schedules which you have to make first and schedule your sessions.
USER PORTAL : - ACCOUNT is the account where you can see your userid and pass to access your rack for every session.
Hope it clears your queries.