Hey I have been signing up for games and needed to pay for them, so decided to pay for my NZlarps membership first… even if I haven’t received confirmation of my payment, can I go ahead and just pay the discounted price for games? I’ve assume I can, but thought I should check.
Yes 
Because here seems appropriate, I registered but haven’t paid yet. But now I can’t get back to page with the details on where to pay and which details to put in the reference and whatnot.
PM would be fine. 
Your friendly local treasurer can point you in that direction
The National Account (for your NZLarps membership): 02-0290-0086913-001
Done, though I may have made up info for the Reference. I hope it makes sense. Now I can pay for The World That Is and Chimera.