How to use a Belkin Universal Range Extender as an access point

I was given one of these and for the life of me couldn't get it to work. Adding security to the device would cause the web management page to crash and make the device unconfigurable. I discovered that though the security on the belkin causes problems the MAC address rules do. So if you've got the same problem leave the device as an unsecured access point and define your MAC rules. Worked first time.