If your talking about donating to the site, click the button on the homepage (www.gaiaonline.com) underneath your avatar that says "donate" and it will give you the option for paypal donation and an address for money order/check donations.
i think you just go to the bank, buy a trading pass, and just make a trade with someone but only put in gold. they dont have to send anything back if i remember right....i havent dont this myself but i have gotten gold from some people. try it and see if it works! 3nodding