1. Take out a frame and a tray, tilt the tray along the frame (one end high and one end low), after fixing the low end, press down the high end
2. Place one end of the fixed tray onto another frame, still at tilt angle, and then press down the high end
3. Take out the second tray, fix the two outer ends to the two frames, and then press down the front end (the high end) of the tray along the frame
NOTE: The installation direction - the protrusions on the two stainless steel frames face outwards, which will make the shelf more stable