Night Hawk X6S

My son helped me set up the router and he registered the device. I was able to get the password changed to login and set the parental controls through OpenDNS but he disenabled it today while I was at work. Now, I can't login the openDNS and enable to parental controls.  Is there a way to delete his account and recreate my own so that I have control over the internet surfing?  Thanks in advance