im cant buy anything

It would help if you let us know what messages you see. If it is asking for you to enter a payment method, Apple has multiple criteria* requiring the presence of a payment method, even for free items. Since you may be encountering one of those situations, you have no option but to enter a valid payment method if you wish to continue downloading. Read the support article Add a payment method to your Apple ID - Apple Support about how to do that. The payment method may not be charged if you also have account balance, but the payment method has to be present. This next article lists valid payment methods for different countries but note that in this case Apple Account balance alone apparently does not meet the requirement: Payment methods that you can use with your Apple ID - Apple Support .