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The DW4020 does not have a DHCP server to hand out the WAN addresses for your computers to use. It will only give one address to one device for the purpose of initially getting into the user interface as you just did. This requires that you set up each computer with a static IP. Start with the computer you just connected to the user interface with.
Open the network properties for the computer and enter a static IP in the same range as what you just copied down from the user interface of IP addresses to use on your network. Enter the assigned subnet mask, default gateway you copied from the user interface and the DNS address given to you by your ISP. If you dont know the DNS address you can use 188.8.131.52 and 184.108.40.206. Reboot your computer. Now you should be able to browse the Internet from that computer and access the DW4020 user interface by entering the same address you used as default gateway as the URL in your browser.
Do the same for each computer on your network, each time using a different IP address from the same range you wrote down earlier. The default gateway and DNS addresses will be the same on all the computers.