How can I find my member ID number before I have my membership card?
If you signed up at a tournament then chances are you'll be a member of the site before you receive your official letter. To find your member number, simply check out the memberlist and look for your username. Ask a member of staff if you get stuck.
Alternatively, you may have joined but not received your package but you then attend a tournament. You won't need your membership number as long as you make it clear to the organiser what your NAF username is/will be, and it might be worth telling your RTC too.