There is a lot of air in my brake lines, and my brakes are practically non-functional. I have read different techniques and orders on how to bleed air out of the brakes. My main question is...how do I bleed the rear brakes? They don't have a bleeder screw that I can see. Below is an image of what I see when I look at the rear brakes. My second question is...what is the proper technique/order of bleeding the brakes on my specific car? I am not using any sort of bleeding kit, and do not have an air compressor. I am doing it with an assistant pumping the brakes.

Thanks in advance.