Check out more details below:How do I activate an MLB.TV subscription? To activate an MLB.TV subscription from ESPN, click on the sign-up page, or navigate to the "Manage my Account" section of the ESPN website or the ESPN App. How much does MLB.TV cost with an ESPN Unlimited subscription? (An ESPN Unlimited subscription is required to subscribe to MLB.TV.) Tap your account on ESPN.com or within the ESPN App and select the MLB.TV subscription or find any MLB content on ESPN.com or within the ESPN App.