Why won't my transmission go into park?

It should be an easy fix. Try to find the shift linkages at or near transmission. When shifting to park its not setting all the way to where its supposed to be. May be an obstruction or a matter of cable adjustment. It will be easier to find the linkages if u turn key on part way, do not start it. Have someone shift from park all the way to first, it should be easy to see movement where linkages are , good luck