Can I merge reservations made without logging in before I become a member into my account after I become a member?

Yes, you can do it by following the steps below.

1. Open the "Reservations made while not logged in" email and copy the "Reservation code".
2. Access "Reservations" from My Menu while logged in, and click "Import your reservation".
   
   
   
3. Paste the reservation code copied in step 1 into the "Reservation ID" field,
   enter your e-mail address in the "Email" field and click "Import your reservation".
   
   
   
4. Confirm that the reservation is listed in the "Reservations" list.