I have only been testing this firewall for a couple of days, so it could be me that's causing the following problem

After the initial installation the following were automatically configured:
Realtek Fast Ethernet Adapter 192.168.1.0-192.168.1.255
VMware Virtual Ethernet Adapter for VMnet1 192.168.160.0-192.168.160.255
VMware Virtual Ethernet Adapter for VMnet8 192.168.87.0-192.168.87.255
This all worked correctly. I wasn't able to access shared folders on another machine so I added this zone:
Zone Name: Machine #3
Start Range: 192.168.1.100 (the address of the other machine)
End Range: 192.168.1.100
I then went to the Add a Trusted Zone Wizard, but on the second page when asked to "Please select a Zone from the list below" the drop-down list showed:
Realtek Fast Ethernet Adapter 192.168.1.0 - 192.168.1.255
Machine #3 192.168.160.0 - 192.168.160.255
VMware Virtual Ethernet Adapter for VMnet1 192.168.87.0 - 192.168.87.255
VMware Virtual Ethernet Adapter for VMnet8 192.168.1.100 - 192.168.1.100
This is obviously not the way I had set up the new zone. The IP addresses show incorrect assignments.
In addition, I could not find a way to Delete a created zone.
Any help appreciated.