My avast icon in the task bar used to take me straight to Avast. Lately it says partly that if I want to continue , to sign in with PW Slight inconvenience
You always have to login with name/pw for my.avast.com.
If not, everyone would have access to your account.
If you mean for the avast application, you posted in the wrong forum.
If you mean accessing the Account section in the Avast app, just check the Remember me checkbox below login dialog to keep signed in.