How do I access my router?

Hi,

For background, I connect to the Internet using a Motorola SURFBoard cable modem. Shaw Cable is my Internet provider.

I've read that I can connect to my router following this procedure:
1. Go to System Pref > Network> Ethernet and look at the "Router" field.
2. In the URL of a browser, enter the Router address identified in Step 1.

I tried this in Firefox and Safari, and I only get an error saying that they can't connect.

I'm having a NAT problem with Vuze, but I hit a wall with the Vuze help offered online because I can't progress beyond the "access your router" step. For what it's worth, Vuze identifies Shaw as a "bad" ISP because of traffic shaping. I've tried all steps they recommend for dealing with bad ISPs.

Any help is appreciated.
Thanks.