Anti-Theft & a discontinued email address

Here is my problem, the gmail account I signed up with when I bought the norton mobile security is no longer active, I did change all the email information on the norton site to reflect my new email address but now NMS anti-theft keeps asking me to "Sign in" on my phone.  It will not let me do this because it wont allow me to change the email address listed, the only field I can change is the password field.

 

How do I correct this so I can sign in using my NEW email account?

 

thanks!