At this moment Blog.com only supports payment through PayPal.
Even if you don’t have a PayPal account, or you don’t want to register one, you can still pay through PayPal using your credit card information. When you reach the PayPal final step for payment, there is an option there for non-registered users.
Please go to the UPGRADES section of your blog’s dashboard and then click the BUY NOW button in front of the premium feature you want to acquire.
Then, hit the CONFIRM VIA PAYPAL button and you’ll see an option that says “Don’t have a PayPal account? Pay with your debit or credit card as a PayPal guest” and you should be able to make the purchase.