Hmm, the counter staff who processed your enrolment didn't brief
you?!
Anyway, at the time of enrolment, you could have booked practical
lesson dates with the counter staff immediately there and then.
Otherwise, she would also have given you your PIN, which you can
straightaway use to book lessons online.
Have you taken your Basic Theory Test (BTT)? If not, I'd advise you
to pass it first before taking any pracs. Otherwise your lessons
would be confined in the circuit.
