You can only access this page if you have Owner role

  1. Click on your name at the header.
  2. You will see a dropdown list; Profile, Subscription, Log Out.
  3. Click at Subscription.
  4. You will see button Option. Click it. You should see Update Payment Details and Unsubscribe.
  5. Select Update Payment Detail and it will bring you to Stripe Customer Portal page.
  6. Upgrade or Downgrade your Subscription Plan. Stripe will automatically adjust the subscription rate accordingly.
  7. Follow through the process until it completes.