I changed my Avast email… but… It still shows my old email in Avast subscription… even when I open up Avast to run a scan… I see my old email up in right hand corner. How do I change that ?
G’day,
Some options and functions are allowed only after 20 posts count on the forum, for another words when you reach 20 posts count you can change your old email in the option settings after you reach the total post count at 20 
The license is connected to the email that you register with.
You can’t just change that.
The guys from suppot can.
→ https://www.avast.com/faq.php?article=AVKB24#idt_041
You can go to your my.avast.com accouount:
Click on Your name and select Manage Emails
http://www.screencast-o-matic.com/screenshots/u/Lh/1449412004525-84981.png
Here you can add a New Email Address:
http://www.screencast-o-matic.com/screenshots/u/Lh/1449412136585-67687.png
Once you’ve verified that address, you can make the New Address your Default.