you're talking about HamSphere 4 and his Shop? (This is the HS 3 forum)
If so, it's very simple: The easiest way is to buy "Hamsphere Credits" first (via PayPal and so on). If you have the credits, just click on "My Cart" and than "Checkout".
You will see the summery of all items and can pay it with your credits. That's all.
73 and good DX from Jörg :-)
Bochum / Germany