Recurring subscription means, when your premium membership expired, you will be automatically charged again for the next 30 or 90 days premium membership. So you can enjoy continued access, without having to re-subscribe every month.
If you don't like this idea, you can cancel it in your account profile. Click "Cancel auto-renew subscription" under "NEXT REBILL DATE". You can cancel your recurring subscription at any time. You'll have access up until the next rebill date, but you won't be rebilled – your account will become free on after last day of premium
Recurring payment are only for 30 days and 90 days. Premium Membership for 365 days is one-time payment.