If you logged in yet, go to https://helpdesk.fantel.com.au/en/knowledgebase/article/how-to-login-into-the-members-portal for instructions on how to login.
Once you have logged into your account, click on the blue Invoices box or the View All button in the Unpaid Invoices section.
Then you will be directed to the My Invoices page. Click on the Unpaid button.
To pay your invoice using a credit card, click on the green Pay Now button of the invoice.
If your credit card is already on file, the default selection is that credit card. Then all you need to do is enter in the CVV number and click the blue Submit Payment button.
However, if you do not have your credit card on file, go ahead and select the Enter New Card Information Below radio button and enter your details and then click the blue Submit Payment button.
If the payment was successful, you'll be directed to the invoice again but this time it is marked as PAID. You can either close the window or go back to the Members Portal Dashboard by clicking on Back to Client Area.