The default IP address is 192.168.168.168
The manual suggests that you use the following IP address on your NIC:
192.168.168.200 with Subnet mask of 255.255.255.0
After you configure your NIC, then you can type http://192.168.168.168
into your browser and if its still at the defaults, you should see the log in window.
The default username is: admin
The default password is: password