To answer your question, here's how to buy forum gold:
https://forums.d2jsp.org/info.php?p=1I draw your attention to this:
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* Please note that your first purchase will not be instant. Your payment will need to be manually validated for your first purchase, but after that you will be able to buy FG instantly and automatically at any point in the future by using the Purchase Gold page.
If you don't have paypal, here are the other ways to buy forum gold:
https://forums.d2jsp.org/info.php?p=2Please do not hesitate to send me a private message if you have any question.