I’m currently running Avast! Free protection and I can log in here and on the regular Avast! site but everytime I click settings on Avast! itself, it says my password is incorrect with no way to change it.
I’d also like to know how to add urls to the block list as I have a pop up showing up on every other click. Even when I pressed login here it pops up!
Your “my avast” account is completely separate from the forums.
Have you created a “my avast” account?
GUI>Settings>Active Protection>Site Blocking 
Yea, I’ve changed my ‘myavast’ password serveral times as well. And still says wrong password.
About the only two other things I can think of are a repair and contact avast.
Repair…Control Panel>Uninstall a Program a Program>double click “avast”>click “repair”>reboot
If that doesn’t work…
Or contact avast using this form in the subject line select “website issues”.