How do I activate the key lock on the Beko Bbim12300x?

Touch and hold the key lock key until the key lock symbol appears on the display, then a 3-2-1 countdown begins and the key lock activates when the countdown ends. Once enabled, touching any timer key will cause the timer to sound an audible signal and the symbol will flash. Note that releasing the key before the countdown ends will prevent the key lock from activating. (Page 22)