how can I change my billing information on my computer

Howdy Compusoft2051,

Welcome to Apple Support Communities.

It sounds like you probably want to know how to change your iTunes Store account billing information. The article linked below will walk you through the process and provide more information about iTunes and Apple ID billing.

Change or remove your payment information from your iTunes Store account (Apple ID)

Change your payment information on a Mac or PC

Click to open your account in iTunes. (You might need to sign in with your Apple ID.)

Alternatively, you can:

Open iTunes.

Click iTunes Store.

Click Sign In and enter your Apple ID.

Click your Apple ID and select Account Info.

1. From the Account Information page, click Edit to the right of Payment Type.
2. You can see the payment methods that the iTunes Store accepts in the Payment Type section. If you want to remove the payment method, select None in the Payment Type section. See what to do if None isn't showing or you can't select it.
3. Change your information and click Done.

After you change your payment information, the iTunes Store places an authorization hold on your credit card.

Take care,

-Jason