How do I replace a tail light on a 2015 tahoe

SOURCE: 2007 Tahoe tail light

1. Open the liftgate.
2. Remove the two screws from the taillamp assembly.
3. Pull the taillamp assembly rearward until you
disengage the inner pins on the taillamp
assembly from the vehicle.
4. Press the release tab, if bulb socket has one,
and turn the bulb socket counterclockwise to
remove it from the taillamp assembly.
5. Pull the old bulb straight out from the bulb
socket.
6. Press a new bulb into the bulb socket and
insert it into the taillamp assembly. Turn the
bulb socket clockwise into the taillamp
assembly until it clicks.
7. Reinstall the taillamp assembly. When
reinstalling, make sure to line up the pins on
the taillamp assembly with the vehicle. If
you do not do this, you will not be able
correctly install the taillamp assembly.

SOURCE: how do i change the tail light on a 2004 tahoe...

Open rear hatch. Remove two mounting screws at the side corner which mount the tail light assy to the body. The whole tail light assy can now be removed. Twist desired bulb holder counterclock wise to remove, then pull bulb to remove. Reinstall in reverse order.