In Avast Free Antivirus and Avast Premium Security you can set a password to protect access to the application and/or the application settings. If you have already created a password but are unable to remember it, refer to the following article:

• Regaining access to Avast Antivirus without a password

Protect Avast Antivirus with a password

1. Open Avast Antivirus and go to ☰ Menu ▸ Settings.
2. Ensure the General tab is selected, then click Password ▸ Create New Password.
3. Enter a password into the first box, then re-enter the password into the second box. Click Create New Password.
4. Select one of the following options:
   • Require password to open Avast and access settings: Enables password protection for opening Avast Antivirus and accessing Settings.
   • Protect access to Settings only: Enables password protection only for accessing Settings within Avast Antivirus.
   

Your password is set. Now when you attempt to access the password-protected areas, you are required to enter your password and click Enter.