I would agree with the above you likely should just buy a newer device. Most the older devices used proprietary methods and would not work with all routers. Many times to make it work you had to run the security set to WEP which is has been completely compromised. To make this work with modern routers it needs to use WDS and I don't think that devices supports that.
Even if you get it to work the performance is going to be rather poor. These devices were used when 10mbps internet was a fairly fast internet connection.