We can change it for you, with your help!
Log out of your LearnToMod account. Go to http://login-thoughtstem.herokuapp.com/ and in the Create Account field, enter your NEW email - make sure it's a live email address, because a verification email will be sent to it. Click the link inside the verification email - that will redirect you to a page that asks for your access key.
The next step depends on whether or not your account is still active. Are you still able to login to your old account, in other words?
If your old account is expired, then enter a new access key. Then enter a fresh LearnToMod nickname on the next screen.
If your old account is not expired, do not enter an access key.
Next, email us back at firstname.lastname@example.org to let us know you signed up with a new email and would like your badge progress and mods transferred. Don't forget to tell us both your old and new email, so we can make the necessary changes.
Finally, login at mod.learntomod.com with the new email. If you get a 500 error, you may need to clear your browser cache and cookies.