Primary problem solved! Okay, here is the solution:
1. First, change the ip address of one computer to the same subnet for example, I changed the computer with 192.168.1.12 to 192.168.0.12. This way, it is on the same subnet as DI-714P+.
2. On the computer with the reassigned IP address, open the web browser and point it to 192.168.0.1 as specified in the DI-714P+ manual. The screen shown in the manual should appear.
3. Open the LAN section from the buttons on the left side of the screen. Here you can change the IP address to one on your network. As soon as you commit this change, you will lose access to the DI-714P+ because it is no longer on the same subnet.
4. Change the IP address of the computer accessing the DI-714P+ back to what you had originally.
You should now be able to access the DI-714P+ from any web browser on your network.
I hope that helps someone out there.