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Changing your email address
To change your email address:
Log in to Twitter.com and go to your settings page.
Under Account settings, type your new email address into the Email field. Note: An email address can only be associated with one Twitter account at a time.
Click Save at the bottom of the page.
A dialog box will appear asking you to confirm your Twitter password. Enter your password in the box and click Save changes.
You'll see a yellow reminder message on your homepage asking you to confirm your email change. It will stay there until you confirm your new email address (see steps to confirm below).
Your email address is not displayed in your public profile on Twitter. If you've enabled the Let others find me by my email address setting, then others that already have your email address may find your Twitter profile through their email address book. More information about this setting can be found here.