I have no codes and am trying to activate alarm code to just sound off if there's a break in.

How do I do this?

 

Be sure to give the sticky titled "Alarm Forum FAQ (Please read before posting)" a read. A lot of the most common issues are already in there...

That said:
A "Safewatch 3000" is a Honeywell/Ademco Vista 20p with an ADT logo and a few minor programming changes. That's what you need to websearch for to get the proper user and installer manuals.

"Retrieving Installer code
Nearly all Ademco family (this includes First Alert, Security Link, and several ADT models) panels can retrieve the Installer code by disconnecting the battery, then the AC power. Wait a minute, then reconnect power in the opposite order. Within 50 seconds, on any keypad press * + # at the same time. Unless the system has had an installer lockout feature activated, the panel should go into program mode. The details by system will vary, but the programming section number that shows on the display will be the location for the installer code (on _most_ panels this will be 20). Key in # and the location number, and the panel will read back the installer code one digit at a time. Exit program mode using *99"

In this case #20 will get you the installer code.

Once you exit programming, enter the following:

[installer code] + 8 + 02 + [new 4 digit master code]
Do this in one smooth sequence. If you hesitate more than a couple of seconds between keystrokes, then new code will not take. Test the new code by turning the chime on and off.