Hi and welcome,
Try the following: launch regedit, locate HKEY_LOCAL_MACHINE\SYSTEM\Software\Comodo\Firewall Pro\Configurations\0\Settings, change value 1 to 0 by pressing modify on entry PasswordEnabled.
Check whether value is 0 for PasswordEnabled entry under HKEY_LOCAL_MACHINE\SYSTEM\Software\Comodo\Firewall Pro\Configurations\1\Settings.
Reboot computer. Now you should be able to access all settings, uninstall CF and change password.
If Comodo Firewall doesn’t allow regedit to change those registry items, try to boot in safe mode and repeat those steps ^