a password - as far as I know I haven't joined up as a member before
The best advice most will give you here is not to book anything through TA or its sister companies. Direct contact with the business you are interested in is best.
Bookings (with all the coordinates) that have been made through TripAdvisor, will be recorded in the "Bookings" box from which you can access from your profile. This is why you need to register on the site.