Your question is too vague.
Purchase a service repair manual.
If the button doesn't move at all on the shift knob it is this. There is a small white part attached to button linkage with a bearing at the top of it. Odds are it is broken and it won't push in because that bearing tip broke of and is jammed in the button assembly of the shift knob.. take off the shift knob and buy the replacement part after prying out the rest of that part from the stick.
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