To update your credit card details, go to Settings then Billing and click on the Update Plan button.

You'll be presented with a box that contains a small button that can be switched between 'Per Month' and 'Per Year'.  if you're currently on a monthly plan, you can update that to an annual plan you will save 15%. 

Selected Per Year or Per Month and then click Continue.

Next you'll be asked to enter your new credit card details and then click Submit.

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