there are a couple of options here. I am not sure if "IP address" means source or destination in your case, so I will show both:
URL.Host equals "192.168.0.1" will match if a client enters something like http://192.168.0.1/index.htm in the browser
URL.Destination.IP equals "192.168.0.1" will match if the user accesses the IP address or a hostname which resolves (DNS) to this IP address
Client.IP equals 192.168.0.1 will match if the request comes from a client with that IP address
Okay I kind of understand that, but this is new to me. If I go to my global whitelist policies and show details I see "URL Host Matches in List Global Whitelist" but not "URL.Destination.IP equals". I'm going to look now but can I edit that?
I would not edit the default rules unless necessary. If you want to work on "URL.Destination.IP" you will have to add a new rule. Go to the "Global Whitelist", hit "Add Rule", give it a good name. A criteria choose "URL.Destination.IP is in list..." and add a new list. Fill your IP addresses into that list. The action should be "Stop Cycle".