From the Play feed, tap on the “Settings” icon on the top right corner of the screen. From the Settings page, you will see a “Membership” section that shows you which membership plan you are subscribed to (OK Play = Free Membership, OK Play+ = Premium Membership), and a link to “Manage Membership”. Tapping on “Manage Membership” will redirect you to the app store to manage your iTunes or Google Play subscriptions.