The account owner is the only person that is able to pause or cancel a subscription.
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Step 1: To pause or cancel go to "Billing Profile" from the top right drop-down menu.

Step 2: From there click "Change Plan".

Step 3: A pop-up will appear. On the bottom you'll be able to click on "cancel your plan"

Step 4: From there you'll be able to select whether you wish to pause or cancel your account. Make sure you read the definitions of pause and cancel before making your decision.