|Most people just leave router firewalls at their default settings. The firewall then adds to your security measures.|
Router settings are accessed by typing something like http://192.168.1.1 in your browser address bar. Your router instructions should give the exact info. You next type a default router access "username" and "password". Often they are initially both set at admin, although you can (and should) change the password.
The settings are usually for quite specialised needs and not at all like, for example, the third party software Firewalls installed on computers,
Always pop back and let us know the outcome - thanks