needed to open a port for a remote printing application, opened port but no luck with getting the app going, it worked prior to new router, my experience with Netcomm routers is limited to say the least so thought a simple test would be to disable the firewall on the router, but do you think I could find anywhere to turn off the firewall,

Can anyone kindly point me in the right direction of the turn off firewall tick box on one of these routers?