That's awesome that your son won the Nerf Elite 2.0 Commander RD6 for his birthday! It's a bummer that the trigger isn't working, but don't worry, we can fix it. To disassemble the toy correctly, start by locating and removing any visible screws on the blaster using a screwdriver. Once the screws are out, gently pry apart the sections of the blaster, being careful not to force anything. As you take it apart, remember to keep track of the pieces so you can easily put it back together later. For more detailed instructions and helpful tips, you can check out https://nerfinfo.com. They have a wealth of information that can guide you through the process step by step.