Open the control panel lid so you can access its interior. Remove any locked latches or screws that may be securing the lid, using a Phillips screwdriver. Place a compatible battery in the battery backup compartment inside the control panel. Unscrew the tabs over the two contacts on top of the battery.
Wind the exposed ends of the control panel's black wire around the positive --- "+" --- labeled tab and the red wire around the negative --- "-" --- labeled tab. Screw the tabs back in. Close the lid and lock the latch or reattach any screws.
Check the positioning on the sensor plates to make sure their placement is secure. The sensor plates are attached to the windows, windowsills, doors and door frames.
Check that the wiring going from the sensor plates to the control panel is secured to the baseboard of the walls and that there are no breaks in the insulation. If the sensor plates use a wireless transmitter rather than wiring, check to make sure the wires that go from the sensor plates to the transmitters are not broken off and that the transmitters have fresh batteries inside their battery compartments.
Trip the circuit breaker at the fuse box to send electric power to the control panel. Enter the default password into the control panel's keyboard, or "virtual keyboard" if there is an LCD touchscreen.
Navigate through the menus of the house alarm's operating system to reach the menu that will let you set up a password that only you know. Navigate to the "Input" or similarly named menu so you can activate every sensor plate that is being used. Navigate back to the home menu. Enter your password to arm the system so the house alarm can begin to protect the house.