Once again a simple GOOGLE search, and the first thing on the list is the manual for this unit!
I suspect this is what you need.
Deactivating the Buttons on the Unit
(Child Lock)
You can deactivate the buttons on the unit
(except for on/off) for preventing misoperation, such as child mischief.
Hold down
(stop/square black button)
on the unit for more than 5 seconds."LOCKED" appears in the front panel display.
The child lock function is activated and the buttons on the unit are locked. (You can operate the system by using the remote control.)
To cancel, hold down
(stop/square black button)
for more than 5 seconds until "UNLOCK" appears in the front panel display.
If that's not the problem, here's the link for the manual.
http://pdf.crse.com/manuals/4446734151.pdf
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