Tengo mi ipad 2 y cada que quiero instalar algo me dice que este apple id no ha sido usado en el itunes store y ya no se que hacer

Hola, por casualidad asociastes una tarjeta de credito a tu apple id para poder realizar las descargas

Change, add, or remove Apple ID payment methods

Manage the payment information that you use for the App Store, iTunes Store, iCloud, and more. When you change your payment information, it's automatically updated for all apps and services that you use with your Apple ID.

To change your payment information, tap or click this button:

https://support.apple.com/en-us/HT201266