HomeMatic HM-RC-12 Operating Manual page 26

The teach button is on the back of the hand transmitter at the
right over the battery compartment cover. This button is located
within a recess in the housing so that it cannot be pressed ac-
cidentally.
To actuate teach mode on the remote control, press the teach
button with a pointed object.
The remote control is then in configuration mode, indicated with
a flashing green of the device LED. (If you want to exit configura-
tion mode, press the teach button again.)
Press the operating button that you want to teach to enter teach
mode.
The device LED flashes orange. (Cancel by pressing the teach
button briefly, the device LED then turns red.)
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