The membership numbers tab is where you can set the membership
numbers for those who register online. You can allocate a new number to
each person after setting the first number.
This tab is only visible if your event type on the "Event Details" tab is set to Membership Fees.
You can also set a prefix and suffix to the member number.
EG. Your member number might be 123 and the prefix ABC so it is recorded as member ABC123.
