Trying to edit my iTunes account

Trying to edit my iTunes account

What do you mean by that?

You are sign in here .  .  .  with your Apple ID & Password.

Your Apple ID is the personal account you use with all Apple products and services. It includes the email address and password you use to sign in, as well as the contact, payment, and security details that you use with Apple.

You can’t merge multiple Apple ID accounts.

Use the same Apple ID for iTunes Store.

Tap iTunes Store and sign in.