How do you completely remove headlight and install brand new? 1991 not 1998

Open the hood , look at the headlight assembly from behind. You will see a white square tab. This is the release for the headlight retaining ring. Depress the tab to rotate the ring , it will only move one way , and the assembly will walk the headlight forward or out. To install the assembly , start it in its "tracks" and rotate the ring the other way and the assembly will pull back into place. The tab will click when it is locked.