To add credits to your account, you will need to be logged in to the portal https://www.voodoosms.com/login. Once you have logged in, click on the ‘Add Credits’ link on the upper right of the portal.

On the ‘Add Credits’ button, input the amount of credits you’d like to purchase and choose the payment method you wish to use. The total cost will be shown on the right side of the page. When you are happy, simply choose ‘Pay Now’.