Subscribing PlayKids is very simple!
On the app home screen, simply tap any book option that has a lock and you will be directed to the subscription banner. In order to become part of PlayKids Premium, simply follow the instructions on the screen.
And you know what? This subscription will give you access to our other apps: PlayKids, PlayKids Talk and others that will be released soon (and you will know it at first-hand by liking our Facebook page). In order to share this subscription, simply create a PlayKids Account in the Definitions of the app.
PS: For subscribing the app, it is important that you have an international credit card associated with your Apple ID. Learn how to register your card here: https://support.apple.com/HT201266