Q: How do I turn on auto-recharge?
A: Login to your admin center at https://www.diamondcard.us/login. Click on "options" link in My Account section. Then click "auto recharge" link at the top. Check the "Recharge my account automatically" check box and choose your settings. You also need to enter your credit card information in the page.
Your account will be auto-recharged when the balance drops below a certain amount. This works only when recharging by credit card.