Why are you asking for my email? How do I change my email address?
You need to register a working email address in your profile. Please use a real address that you check. We will not spam you, and we will not give out your address. (Only site admins can see it; they can also see the email address you used when you signed up.) We use your profile email address to send password reset emails, reply to messages you send through the Contact Form, or contact you about specific site matters.
By default, your address is hidden from everyone else and not shown on your user-facing profile page. Only if you set your preferences to show it, will your email address show up in your profile -- and even then, it only shows to registered logged-in users.
Being contactable by other users can sometimes be advantageous. Many members use a semi-disposable address for MetaFilter only so that people can contact them. You can use MeFiMail for contacting other users and being contacted if you don't want to have a user-facing email address.