3Com OfficeConnect Dual Speed 16 Plus Networking Switch "ip finder" Questions

...IP Address 2.Open up the finder on your Mac. 3.Click the Applications button near the left of the page. 4.Click the Utilities button near the right of the page. 5.Click the AirPort Admin Utility ...

IP address is? Also, I cant see a reset button on the router? Do I need to find this as presumably the previous owner had a password to use it. on a mac u have to go to finder, applications, uttility,