LG Refrigerator LFX25960ST - Reviewed the Service Manual But Cant Figure Out Fill Key

I just reviewed the service manual for the Ice Maker Diagnosis but I cant figure out which button is the Fill Key as stated in the service manual....

The function test of the ice maker is started by hold the fill key for 3 seconds....I just dont know where the fill key is.

Thanks for any help!

Press the *round* cube size selector button for 3 seconds to initiate icemaker test mode/cycle.

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Source: LG Refrigerator LFX25960ST - Reviewed the Service Manual But Cant Figure Out Fill Key