To view your membership details, simply log in to your user account → account details → subscriptions. Here you can view your membership type, member benefits, and navigate to the gear portal to make any changes to your subscription.
Note that all subscription changes must be made in the gear store portal. You can navigate to the gear portal through your subscriptions page, or by logging in here, and navigating to manage subscriptions. If your gear account has not been set up, you may have to create an account with the same email used to purchase your membership.
Note that changes made to your membership may not be reflected in your subscriptions page until your next order is processed, and the gear store portal can be used to view your most up to date subscription information.