To Add your Credit Card, you will need to go into Account Settings and Click on the gymGO Billing Tab. This Tab will show you what credit card you have on file, when your next payment is due and the amount.
My Credit Cards-> This is where you will add your Credit Card in order for gymGO to bill your account as well as if you need to purchase more gymGO Credits you will need to add a credit card. Click into Add New Credit Card
My Next Payment -> You can also find out when your next payment is due and the amount (what gymGO plan you are on) while in gymGO Billing