That's because there are not any, or at least mine did not come with instructions either. Hopefully you are the type of person who likes to tinker, figure stuff out, and experiment because there are many things with current 3D printing technologies that you just have to figure out as you go! I've had my printer only a couple weeks and I've spent as much or more time tinkering with it than I have printing. What is your specific question? How to install the heated bed? Maybe if we knew what, specifically, you are trying to do then we might be able to help you more.
SD4 w/ RUMBA, E3D Volcano, all bearings, glass bed