I have a DLink DI-624 router in my rather extensive home network.

Now I want to set up the ASUS WL-500gP such that it connects into the WiFi network of the DLink so that I then will be able to talk to the ASUS via the WiFi network.
I do not want the ASUS itself to allow other units to connect to it and get addresses, that is the task of my main DLink router.
But I need to be able to talk to the ASUS itself over the WiFi.

How should I configure it to allow this?

I have looked at the Wireless/Advanced page and found "Extended mode" where I can select "AP or WDS", Station or "Ethernet bridge".
Is this the right place to set the ASUS up as above and if so what should I select?

The guide I am following talks about WDS but my DLink DI-624 is not capable of that and I don't see any point in it anyhow since I will not have any devices attach to the ASUS via WiFi. My only aim is to connect the ASUS itself into the network so it is accessible via WiFi.

Any ideas please?