Look for the input telephone jack on the back of your GE NX-8. It should say, "LINE JACK." Insert the telephone jack into it. Consult your user manual if you cannot find it.
Attach the other end of the telephone jack to your telephone. Connect the AC adapter to your GE NX-8 system and plug it into a wall outlet.
Add three or four contact numbers into the system. Press the "CONTACTS" button and follow the prompts. Include a trusted neighbor and your local police station.
Select a contact on your list. Press the "CALL" button. Your GE-NX 8 system should automatically dial the number and let you speak with that person.