OK, thanks for the additional information.
Power off all of the A1392 Expresses
Wait a minute
Power up one of the A1392 Expresses and let it run a minute or two
Hold in the reset button on the back of the Express for 7-8 seconds, then release and allow a full minute for the Express to restart
Connect an Ethernet cable to the WAN "O" port on the A1392 Express devices

Click the WiFi icon at the top of your Mac
Click on AirPort Express under the listing of New AirPort Base Station

That will get the setup "wizard" up and running. It will take a few seconds to analyze the network and then suggest the correct setup. The window will look similar to this, except that you will see your devices and network name:

Type in a device name like Express1, for example
Click Next
Watch the next screen carefully to verify that the Express is being set up to "extend using Ethernet", which will confirm that the setup wizard has picked up the Ethernet cable connection to the Express and will apply the correct settings

When you see the message of Setup Complete, click Done
Repeat the same process for the other two Express devices that will connect using Ethernet, assigning device names like Express2 and Express3, for example, to keep things straight.
For the A1264 Express:
Open AirPort Utility (Finder > Applications > Utilities > AirPort Utility)
Click on the picture of the A1264 Express
Click Edit in the smaller window that appears
Click the Wireless tab at the top of the next window
Change the setting for Wireless Mode from "Extend a wireless network" to "Join a wireless network"
Click Update at the lower right of the window to save the new settings and give the Express a minute to restart
