If you used the DMX deck and were able to get the channels on the LE to raise and lower the USB dongle is communicating properly with the LE.
Now for programming the LE here is the standard method:
Programming the Express:
(At the Express...) Put your Express in program mode by pressing the "Mode" button until "PRG" appears on the LED display. Next, press the "Select" button -- a decimal point (dot) will appear on the right of the LED display to show "PRG." You are now in program mode.
(At the software configuration tool...) Select the "Program" button to send the channel configuration and light curve software to the Express. If you can observe the Express's LED display, you should note that the starting channel number now appears on the display. If it continues to show "PRG.", press the button again. It may take multiple attempts.
NOTE: you may choose to start the configuration tool first, and select the "Program" button within the tool -- then visit the Express within your yard to press the "Mode", then "Select" buttons. Either order will work.
(At the Express...) After the channel is assigned, reboot the Express by pressing the "Reset" button.
Hang in there, it will happen.