In order the change your subscription, you must first sign in to your account. Then proceed to "Account" as shown below.
Once you are in your account, click on "Manage Subscription", then "Change Subscription".
A pop up will appear, which will allow you to choose a subscription from the dropdown. Then click "Change" and then follow the prompts to confirm the payment.
That's it! You would have chosen and successfully managed your subscription.
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If you have any questions, you can find help here.