It's really easy to change your email address on The Muse. Just log in to our site and click on your name in the upper right hand corner of the screen, and then click on "Settings." You'll be able to update your email address there.
Quick note: If you signed up using LinkedIn, you can't change your email on our site because it's controlled by LinkedIn. We'd suggest creating a new account as it's the easiest way to make sure you get all your Muse goodness to the right email going forward.