How to get to stop light in back window of 95 lincoln cont. Bulb is burnt out. do we change from trunk side or inside of car? also have a problem with interior lights staying on for a long time after car doors closed. Dash light says door open, could there be a bad door switch or a relay?

Quoting from link:

https://itstillruns.com/replace-lights-lincoln-town-cars-7660993.html

Tail Lights, Stop Lights and Rear Turn Signal Lights

Turn the Town Car's engine off, and open the trunk. Remove the trunk retainer if your Town Car is equipped with one. Put on the gloves.
Pull the carpet away in order to access the tail lamp assembly. Remove the three nut-and-washer assemblies with a socket wrench.
Remove the desired bulb socket by turning it counterclockwise, and then pulling it straight out of the assembly. Pull the old bulb out of the socket, and install a new bulb. All three lights use 3457AK-type bulbs.
Place the socket back into the assembly, and reinstall the three nut-and-washer assemblies. Place the carpet back into the vehicle, reattach the trunk retainer if necessary, and close the trunk.

https://itstillruns.com/replace-lights-lincoln-town-cars-7660993.html

If it is in the rear window then there might be a pop off cover. If it is located on the trunk then open the trunk and it should be right there

Remove 3 nuts, inside the trunk

Pull lamp housing away from body

Do not use any bulb made in China, or
you will be back there in a few months

Open trunk,pull trunk interior/liner away from back left corner
Remove three nuts, that hold tail light housing
Remove housing and replace burnt out lamp
They use an extended duty lamp/bulb,you may not find that
I add, that most China Made bulbs, don't last a year. So look for a Wagner, made in Mexico,France etc

High Mounted Stop Lamp Removal & Installation To Remove:
High Mounted Stop Lamp

1. Disconnect battery negative cable.
2. Disconnect high mounted stop lamp electrical connector from inside trunk.
3. Remove package tray.
4. Replace bulb from package tray.

To Install:
High Mounted Stop Lamp

1. Install package tray.
2. Connect high mounted stop lamp electrical connector from inside trunk.
3. Connect battery negative cable.

from inside the trunk,remove 'push pins'holding plastic panel opposite tail lights.remove panel,fold back fabric if necessary,to access lamp holder[s] rotate 1/4 turn counterclockwise,pull bulb straight out.

I recommend autozone if you buy the bulb from them they will assist you but I believe it has to be replaced from inside the trunk

Pop the trunk! Look behind the lights and you will see plastic "bolts". twist them off and pull back the carpet. Then you will see more bolts. Take them out and then gently pull off the assembly from the rear. Find the bulb that is out and replace it. On some you may be able to just replace it from the inside of the trunk. It's pretty self explanatory when you get the carpet out of the way. Just be sure to remove ALL of the bolts before pulling on the light assembly. Hope this helps!

open the trunk, and pull the linning away from the body. It should easly move. you have access to the lighting fixture. determine which is the stop light and turn the base counterclockwise to open. remove the blown bulb. To install the new, do not touch with your bare hands, use a soft cloth or paper towel to seat the bulb into its socket. reinstall by truning the bulb clockwise to seat in place. Press your linner back into place.

remove the trim panel at the very rear of trunk, remove it and place it out of the way, remove tail light Assembly retaining nuts top and bottom, I think there are 6 per side, pull the tail light assembly straight back to access the bulbs for replacement.