KathyP wrote:I will agree If my child was 7yrs old but he's 17 with his own computer. I don't mind him having access to the administrative setting, however, I do mind having control over what type of content he's able to look up. My main objective is to fix the problem at the router if it can be done and that way there is less restriction for his sake.
Hi KathyP,
I noticed that you gave a [MeToo] to Titan's ConnectSafe inquirey about preventing bypassing a router's ConnectSafe settings, and I was therefore wondering if you had tried using the suggested ConnectSafe DNS router settings in your Belkin N600 - then afterward only to discover that your young person had circumvented those settings by overriding them using the direct configuration their computer's TCP/IP DNS stack with an alternate DNS? 
FWIW, I looked up your model router's user guide and found that at least some versions of it (perhaps all) have an intergrated ConnectSafe use option. I also noticed that the manual warns that the implementation can be bypassed by doing exacly what I mentioned in my previous paragraph. FWIW, there are other ways a savvy individual can bypass this level of very simple deterrent - for example, using a VPN tunnel typically conveys the remote network's infrastructure services (including the remote's DNS) to the local computer. 
The only relatively "sure fire" method of blocking such network traffic is by employing the use of more sophisticated firewall solution such as a SonicWALL and that can be a costly option to use... 
Because of this, and as long as it is important enough to you, reconsidering Krusty's suggestion about a non-administrative account may be your overall best choice.
Kind regards and best of luck in your endeavor,
John