To remove/tighten the hinges you need:
1. Phillips head screwdriver
Removal of rear shelf.
Disconnect the cargo net from hooks.
Remove the "hooks" that secure the rear cargo net to the rear carpeted vertical shelf.
Note how screws attach to the hooks.
Note how the hooks attach to the rear shelf.
Remove the hooks, lay to the side, and GENTLY pull the vertical unit forward. NOTE, work around the boot release handle. The very long and fragile trim panel above the rear shelf could/should be removed.
Upon removal, locate the two nuts that secure the hinge. ((You will have to look up inside this removed area. The nuts could be loose and laying on the floor of the removed area)).
Reverse the process to attach the vertical shelf.