Disklavier

Thanks Matthew for the quick response to my  problem.

I have reviewed the  settings in  Airport Admin  Utility.  I did see various options for setting 
the Apple Express.

I see  "Create a Wireless Network (Home Router)" in the pop-up. 
I see where to set up  Airport Express as a WDS "remote base station". 

I did not see a place to set up my  Home Network (Main  Base Station) to WDS.

A support page on  Apple says "Wireless Distribution System is another way for AirPort 
Express to join an existing Wi-Fi network. AirPort Express uses its Ethernet port and can 
offer its wireless access point in WDS mode, but it requires that your other access points 
be AirPort Extreme and/or AirPort Express. Client mode's advantage is that you can join 
the networks of non-Apple access points and earlier AirPort base stations ("Dual Ethernet" 
and "Graphite" models).

I do not have the Airport Extreme model.  I have the older model.  So I  may have to 
replace my current Main  Base Station in  order to set it to WDS.

I will investigate this further unless you have a suggestion.

Regards,
Joan