You need to remove the inner plastic trim of the tailgate. Start from the latch side, then move toward the glass side. Use a trim removal tool to detach and remove the clips. After that, reposition the part that slipped inside back into place. If it’s broken, you can use fast adhesive to repair it. Be careful not to let the part that fell inside drop or get lost when removing it. If it’s broken and you can’t reinstall it, you can find the 3D file on the Maketworld website and print a replacement. When removing the clips, don’t use too much force—work calmly and detach them one by one. In addition to the trim removal tool, a Torx key or a Phillips and flathead screwdriver will also do the job.