Changing your email address can be done with just a few clicks. To start, on the homescreen, go to your profile using the Profile button in the left sidebar.

Right away, you should see a box labeled Change email. (If you don't, click Settings in the top menu bar.) Enter your new email address in the first field, enter it again for verification in the second field, and enter your password in the third field to verify it's you. Then, simply click Change, and done! Your email address has now been changed.