Click on the symbol at the top right of the Maniac website. If you have not registered an account, you will need to create an account using the same email address you used at checkout.
Once your Maniac account is registered, you can log in and access manage your subscription by clicking on the Manage Subscription link.
You can also access your account using a customer portal magic link. This magic link is usually sent in the Subscription Confirmation email and the Upcoming Order email.