How do I open the rear doors from the inside, 2002 Chevy Astro AWD LS Passenger

Open each rear door from the outside near where the door latch is on the end of the open door should be a switch (more like a lever) that will say something like child lock . Move it to the opposite position hop in and open your door. Repeat for the opposite door. It is a device used to keep children from accidentally opening the door and falling out while going down the road.

This is a bit in invasive but if you remove the interior door panel you will quickly figure out how the doors operate . I tied a string to the rod that operates the door latch and drilled a small whole in the door panel fed the string through the panel and tied a few knots to keep it from popping back through the panel . Keep in mind you want the string to be short enough that it doesn't easily get caught on things as that could be dangerous . However I'm planning on upgrading it with a latch and lock system from eBay and some throttle cable I have around ! Good luck

Also the window latch screws can be removed with the right flat head screwdriver if you don't have hex bits around