If you already have an existing router/network and you are planning on adding the wireless router for wireless access, you will need to configure the wireless router as an access point.
Log in to your router's configuration page (http://192.168.1.1)
Type in “admin” for both username and password
Click on “Setup” at the top
Scroll down to “Network Setup”
Now you will need to change the “Local IP Address” of your router to something that will communicate with your existing network. The first three blocks of numbers of the IP address have to be the same as your existing network.
If your network uses a gateway of 192.168.0.1, the “Local IP Address” needs to look like this: 192.168.0.x, where x is any number between 1 and 254.
A safe choice for "x" is 200. So in that case your router will have a “Local IP Address” of 192.168.0.200
The subnet mask has to be exactly the same as the subnet mask that your other computers use.
Once you are done with that, scroll down to the “DHCP Server Setting” section.
Change “DHCP Server” to Disabled
Now scroll down to the bottom and click “Apply”
To connect your AirLink router to your existing router/network, you need to connect a cable from one of the LAN ports on your main router to one of the LAN ports on the AirLink router. You will not be using the WAN port on the AirLink router.