You need to know the installer code for that panel. Hint: ADT uses a standard, common code.
Read your contract carefully. You may be forbidden from making any changes to a system that new. Any entry into the programming mode will be logged, visible on the downloader, and may be reported to ADT via the dialer.
Troubles and supervisories on Ademco systems aren't self-restoring, you normally need to do a code-1 a few times to see if the trouble clears.
Long story short, to disable a zone, set its response to 00 (not used).