Realms is a subscription for a personal multiplayer server to be used with supported versions of Minecraft (game sold separately) on PlayStation® and other supported platforms on which you own the game (Minecraft Java Edition not supported). To cancel, see “How to Cancel” below. 
HOW TO CANCEL:
From a PlayStation®4 console:
Sign in to PSN™, then go to [Settings] > [Account Management] > [Account Information] > [PlayStation® Subscriptions]. After selecting the subscription you want to cancel, select [Turn Off Auto-Renew].
From a PlayStation®5 console:
Sign in to PSN™, then go to [Settings] > [Users and Accounts]. Select [Account] > [Payment and Subscriptions] > [Subscriptions]. After selecting the subscription you want to cancel, select [Cancel Subscription].
From a Computer:
Visit https://account.sonyentertainmentnetwork.com, sign in to PSN™ and then go to the Subscriptions Management section. After selecting the subscription you want to cancel, cancel the automatic subscription renewal. Call Consumer Support at +1 877-971-7669. 
You need to log in to your Realm once every 60 days for the Realm to remain active. PlayStation®Plus membership is required to play on PlayStation® (sold separately). If your subscription is inactive for more than 18 months, your Realms data will be deleted from the server. ISP fees may apply. Realms discounts cannot be combined with other offers and are not redeemable for cash. Requirements, features, online services or subscription subject to change and/or retirement. Subject to the Microsoft Services Agreement (microsoft.com/msa), Minecraft EULA (www.minecraft.net/eula) and platform-specific Minecraft terms (available via the Terms & Conditions button above).