The first and most important thing is to make sure it is not loaded. Inspect the magazine and the chamber.
If your AR has a scope with a quick release, I suggest you take it off.
Locate the two pins that connect the lower to the upper and remove the rear first by pushing it in from the left side and pulling it out from the right side. Repeat this procedure with the front pin.
At this point we remove the bolt carrier and the charging handle.
Bolt disassembly. Locate the cutter pin that is holding the firing pin. You can use any pointy object and the pin should slide out. Next align the pin that holds the bolt so that you can pull it out.
Thanks for watching. Be safe!!