Help with a rule please

Hello, i cant seem to get my head around this rule.

when HSM is in Arm away mode if the front door contact is open ( as in you are coming home) i want the Piezo buzzer to beep two time, just to let you know the system is armed and has to be turned off.

so i have these 3 elements but i cant seem to get the rule correct for it to work.

HSM ARM AWAY
BEEP SWITCH ( PIEZO BUZZER)
DOOR CONTACT

Thanks for any help.
Sean

This would be my starting point.

TRIGGER
Front door contact open.
ACTION
IF
HSM is armed.
THEN
With Piezo buzzer
Buzz twice
END IF