[SIZE="3"]I allow my son to use the internet or cut him off by browsing to my wired router, logging on and filtering or unfiltering the MAC address of his PC. I noticed that there is a feature to allow remote management in the router settings which is not checked. How does this work? If I check the allow remote management feature, would I be able to log on to my router remotely and filter or unfilter his MAC address on those days when I am away on business? And if so, how would I access my router remotely?[/SIZE]
Yes, that's exactly what its for.
You'll access the router from the internet using your external IP address and the port that is specified in your router settings.
If you are using a typical residential connection, you likely have a dynamic external IP that can change whenever.
For this reason, you will likely find a dynamic dns (DDNS) setting in there. If you set that up, you can use the dynamic dns domain name and the specified port to get to it from the outside