Start by logging into the customer zone via this link: https://billing.misshosting.com/clientarea.php

Step 1.

Click on your profile in the top right corner where your name or company is displayed and select "Account details".

Step 2.

Click on the blue button "Account details", select "Payment methods" and then click on the button "Add New Credit Card" as shown below:

Step 3.

Here you can fill in your card details. Ff the default address doesn´t match your billing address, click on "Add a new address" to change it. Click on the blue button "Save changes" to save your newly added card.