How do I upgrade / downgrade or cancel my plan i.e. subscription?

Click on your profile icon on the top left corner of your screen.

Select "Settings"
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Select "Team Settings"
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Next select "Team Billing"

Select "Open" and follow the prompts to open the billing portal in a new window
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Select "Update subscription"
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Select the the plan you wish to upgrade or downgrade to. If you wish to cancel paying for your place please ensure you select "Free" Plan and select continue.
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Follow the prompts to enter payment details and confirm, that's it!