Change Email Account

Hello, Claire.
We'll certainly update your registered email address. We've sent an email, please revert it with requested information to process your request.

I no longer have access to email account I originally set up my AVG account.  How do I change this to email account I use now.
Thanking you in advance,
C Elliott

Hello, Claire.
We'll certainly update your registered email address. We've sent an email, please revert it with requested information to process your request.

Have answered questions as best I can.  Waiting to hear from you. 
Claire