Hi Emma,
As Ron said, you need to activate it in your Planet Auran Download Tickets section first. Thereafter here is what you need to do:
Close CMP and Trainz completely.
Go to Planet Auran, change your password and save.
Now change it back if you so wish.
Then log out of Planet Auran, and back in again.
Now start CMP again. Assuming your Planet Auran details are filled in correctly in Settings, your FCT access should be live almost immediately, no need to wait a couple of days.
Cheerio,
Nicholas