The push button on shifter wont go in when u put brake on. Where is the nuetral

The brake interlock system is not functioning properly. There will be a little hole to stick a screw driver into, carefully insert it into it to release the handle to shift. You don't need to push hard. You will feel it pushing back since there's a spring in it. The problem could be many things and it should be properly diagnosed by an auto mechanic.

Just to answer your question.... Neutral safety switch is located on transmission under the shift linkage lever.