Please follow the instruction below:
Step1: First login to your Control Panel from:
Step 2: Click on 'Billing' then 'Add Fund'
Add the desired amount of money and make a payment. That's it.
How to check the balance
In order to check your available balance. Click on the 'Notifications' on the top right-hand side.
How to use the balance?
The credit does not apply to an invoice automatically so in order to use your Credit in your invoice or on your next order you have to click on the 'Unpaid' invoice and then Apply the credit as it shown on the image below