If for some reason your Plus+ account has been cancelled, you can resubscribe easily via the same process you used to subscribe. Simply head over to the Mysterious Universe Plus+ Page and select a payment plan.
Once you have gone through the payment process, you will be redirected to the registration form. Once on this page you will see two options at the top of the page.
Please fill in the form for existing members and you will then be prompted to log in. Use your usual log in details and you will now be resubscribed!