How do I put iTunes back on PayPal preapproved payments for iTunes and iCloud after accidentally removing it from PayPal as my payment preference?

Hi LydiaCor,

Welcome to the Apple Support Communities. I see you'd like to change your payment method for iTunes.

You should be able to do so using the guidance from the "Change your payment information" section here: Change or remove your Apple ID payment information.

Regarding PayPal, there's some information below that may apply, from the resource titled Payment methods that you can use with your Apple ID:

If you can't connect to a payment service (like PayPal or Alipay), sign in to that service's website first and make sure that your billing details are correct.

I hope this helps you.

Take care.