How do you convert an existing account to Google login?

I have an existing Avast account that I would like to convert to use Google login instead of the user name and password I originally setup, does anyone know how I can do this?

Hi,

To log in to my.avast.com you need to enter an email address (as user name).
If the current email address (used for your Avast account) is the as the google.com email address then
you can simply login using the google option.

If they are different then you need to add the β€œnew” google email as an additional email (and Set as primary).
Please see this guide:https://support.avast.com/en-ww/article/Account-FAQ#idt_090