Lisa:

You don't PUSH station 4---you GO to station 4. That is the ONLY station (phone set) (extension) that will allow you to program. All of the other stations (phones) (sets) do not allow system programming. No matter what you do---they will not allow system programming. That is why you have to determine WHERE station 4 is in your house. When you determine that---then GO to that station and program. Perhaps you can take a good display phone and plug it directly into your KSU --into station port 4. Do you have at least 4 phones on the system?? Now--this is assumming that your system is at default--don't forget.