For people that are just getting into programming radios and do not know what they are doing, there is a thing in the problem called "HELP" file.
I know you are trying to help your vol fire dept. I have seen your request's on other post's.
If I where you and you where going to keep doing this, then take some time to spend with some one who has nore knowledge.
Now with that beening said, open your program, read the radio, now there should be a selection that say's w/n , should be the third colum from the left, highlite, press the space bar until you get an N.
The frequency on that channel is now narrow band.
Again, if in dought about a setting, just highlite and press F-1