Hold the LOCK and UNLOCK buttons at the same time
Once you hear a beep on the system, it will display the blue screen shown below. "Sn" stands for the sensor number. The "Grp" number is used to change the behavior of the device. Then there is the default name "Front Door" which can be changed by scrolling up or down using the arrows on your keypad.
At the moment, the "Grp 10" will be flashing, indicating you are in edit mode. For the keyfob, enter "1" and press "OK".
Now, the "Front Door" will be flashing. Scroll up or down till you have found the proper name and then select "OK" twice.
When the screen says "Trip Sensor 2", you can either continue adding new sensors or you can press the "Status" continuously till you reach the disarm screen.