You should be able to do that here (in UserCP > Edit Profile): http://www.codingforums.com/profile.php?do=editprofile
There will be a button that says to edit email and password. Follow that one and you can specify the new email address or change your password.
BTW, if it gives you a confirmation link in your email, you may need to copy it out and paste it in the browser address. I recall doing this a long time ago, and it wouldn't verify properly if I followed the link, only if I pasted it it.