How to add balance to your account
First, log in to your billing account, then head over to the dashboard.
There you'll see a button called "Add Balance." Click on it and a popup window will appear asking you to enter or choose the amount you want to add.

Just enter or pick the amount you want, then choose your preferred payment method.

After that, click on "Pay Now." Once your payment is completed, the balance will be added to your account automatically. You can then use it to renew your servers or purchase new ones using your account balance.