Slide the carriage onto the MakerSlide. Adjust the eccentric spacers until they v wheel is just contacting the v rail. You do not want excessive pressure or you will damage the wheels.
The belt is threaded around the pulley and idler wheels as shown below. Firmly attach one end of the belt to the rail. When you do the other end, tension the belt as you tighten the last belt clip.
The selection of the control system is left to the end user.
There is a very basic open source one available though. This has been tested with grbl shield, the buildlog.net stepper shield and the ITEAD stepper shield. These all use an Arduino as the controller. Some other boards with built in Arduinos would work as well such as the G1 or X1 from www.pancatt.com.
For best results, dial the current as low as you can before motion stalls. Lower currents will make the motor run quieter. Set it up for highest microstepping too.
Here are two blog posts on the subject
A very basic version of Arduino controller firmware is attached in the digital files section of this project.