There are a few different ways that you can manipulate the l4 and l5 vertebrae in order to relieve pain or improve mobility. One way is to use your hands to apply pressure to the affected area. You can also use a massage ball or foam roller to massage the area and help loosen up any tight muscles or knots. Another way to manipulate these vertebrae is by doing traction, which involves gently pulling on the spine in order to stretch it out. If you're not sure how to do any of these techniques, it's best to consult with a chiropractor or physical therapist who can show you how to properly perform them.