click on clubs (green tab) 

Join a club  (middle)

scroll down to Stanway and on the right push join.

Fill in your details (up the top pick the type of riding member)

Pay the NZPCA $40 with credit card.

The remaining $120 into Stanways account  11-6917-0002179-11

Every family/Rider must also have one Adult nzpc membership $15 payable credit card nzpca

(pick this at the top of the screen (pull down tab)