Change the Default Email on an iTunes Account
If you want to purchase and download items from the iTunes
Store, iTunes requires that you create an account.
It uses the email given during registration as your default
Apple ID for logging into iTunes services and for sending receipts for
purchases.
If your primary email address changes, you can edit your
account information to use a new default email address.
Launch iTunes, and then select "Sign In" from the "Store"
toolbar menu.
Type your current account credentials and click "Sign
In."
Select "View My Account" from the
"Store" menu, type your account credentials again and then click
"View Account."
Click the "Edit" button beside your Apple ID on
the "Account Information" page.
Type the new email you want to use beside
"Email," and then click "Done" to change the default email
address associated with your iTunes account.
Changing account information
http://support.apple.com/kb/HT1918
Access an iTunes Account From Another Computer
Your iTunes account allows you to purchase music, videos,
and other types of media directly from the iTunes Store, and can be accessed
from a number of devices, including your iPhone.
In order to access your iTunes account from another
computer, you must enter your account information into the Sign In page of the
iTunes program.
Once signed in, you can authorize the computer to play media
purchased from the iTunes Store and set up other iTunes-exclusive features,
including Home Sharing.
Click "Start" on your Windows PC's taskbar, then click
"Programs," "Apple," and "iTunes" to run the
program.
For Macintosh computers, open the Applications folder in
"Finder" and double-click the "iTunes" icon.
Click the "iTunes Store" tab, then click the
"Sign In" button on the right side of the program window.
Type in your registered Apple I.D. email address and
password, and click the "Sign In" button.
Click the tab in the upper-right corner of the iTunes Store
window with your email address on it, and type in your account password.
Click the "View Account" button to access your
iTunes account.
Click the tabs on the right side of the window to access
different areas of the account.
Click the "Done" tab to save and exit out of your
account settings.
http://support.apple.com/kb/ht2731
Change My iTunes Account Settings
Apple iTunes is a digital media player that you can use to
download and play audio, video, podcast and television shows.
It's compatible with both the Windows and Mac operating
systems and it can sync its files with the iPod, iPhone and iPad.
Your account settings are used to manage your iTunes account
and store your email address, payment information and password.
If you wish to change your settings, you can do so in a few
clicks.
Launch the iTunes application on the desktop.
Sign in with your iTunes user name and password.
Click the
"Store" link at the top of the screen.
Click "View My Account" type in your password,
then click "View My Account" once more.
Click "Edit."
Select the settings you wish to change such as email
address, password or payment options by highlighting them and changing the
information in the boxes.
Click "Done" when you have made your changes.
Changing account information
http://support.apple.com/kb/HT1918
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