First, log in to your Business Glu account either on the web or desktop.
Click on the ACCOUNT button found on the toolbar at the top of your screen:
Now click on Subscriptions to manage your subscription.
You will then see the current information about your subscription.
To change the information related to your current credit card, click on Payment Methods. To update the card on file, next click on Edit Payment Method.
Enter your Card Number, Expiration and CVV then click Update. The new card will be stored immediately and billed moving forward for your subscription plan.