You can login to your account at alluster.com/login .
Once you are in your account, you are able to select the “My Account” option on the bottom right of the screen. Or select this link: alluster.com/customers/profile .
On the next page there’s two tabs on the top of the screen that say “My Profile” or “Billing”. Select Billing or this link: alluster.com/customers/charges .
Then click “Update Billing” under your current card information.
Then update the new card and click “Pay”. This will then become the new default card on the account.