i just need some help
If you forgot your Avast password, you’ve to reinstall.
It’s your password. We don’t know it and Avast doesn’t know it.
The only way to clear it is to do a clean install. Remove Avast through control panel after a reboot, use the avast removal tool.
More information of how to use the tool: https://www.avast.com/en-us/uninstall-utility