Raise left side of green panel to make it vertical.
The panel, violet front legs, blue rear legs and yellow bars create a parallelogram mechanism.
Adjust black screws to make the green panel horizontal.
Orange spring pin locks the panel at its vertical position. Pull the pin to unlock.

STEP files of this video:
http://www.mediafire.com/file/9s8jf6m...
Inventor files of this video:
http://www.mediafire.com/file/xm8exop...