i am a window fitter in the uk i do these on a regular basis, there should be a frame model number or make on it the best thing to do is look it up on the internet, but basically the bottom flaps open as the pics above then drop the top1, and fold that open too and then push it to the top and then it will look like it has hinges at the top and bottom but sum1 will have to hold the top 1 open. sorry i cant be there to help LOL
