At the moment it is not possible to change your credit card info directly, so what you want to do is cancel your current subscription and then re-subscribe with your new credit card. You won't loose any data.

Step 1: Unsubscribe

Go to your account page through the menu at the top right.

On your account page, find the button that reads: "Cancel subscription" to cancel. 

Step 2: Sign up again

After you unsubscribed you can still use your account for the days you already paid if you cancel in the middle of a cycle.

If your subscription has already run out you can just sign up again by picking a plan:

If you still have some paid days left you might want to wait until your subscription runs out so you don't pay twice for the same days.

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