I'm glad he's having fun with LearnToMod! We've added one more month access to his account just now. When he runs out of time, his mods and badges earned will still exist -- he just needs to a buy a recurring 1-yr subscription from learntomod.com in order to access it.
After purchase, we'll send an access key to the email you pay with (it doesn't have to match his login) Then, he'll login to his learntomod account as usual and enter the new key.
You can opt out of autobilling by emailing email@example.com with your receipt -- tell them you want to cancel but still want to use learntomod the rest of the year.