Reply #1: Easy!

[Stinky The Clown]

Open iTunes

In the sidebar, click on "iTunes Store"

If need be, log into the store.

On the upper right, just below where it says "Welcome Zoigal," there are a series of "Quick Links". Click on "Account"

This will bring up a window asking you to again log in. Enter your password and kit the "Return" key on your keyboard.

You are now at the window with your account details. To the right of each detail is a button to make changes.

When you're finished, scroll down and click on the "Done" button.

Voila!