You can't do this directly. One work around is to forfeit a match to them, but WGT gets their rake if you do that. Another option is to buy a gift certificate from one of the participating companies (CVS is one, there are others) for the amount you want to gift, then PM the redemption code to the recipient. They can then use it for WGT credits by changing their payment method on the Get Credits / Buy WGT Credits page.