A little over halfway down the electronics installation page is this paragraph:
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Connect ATX Power to Steppers and Extruder
The stepper drivers and extruder controller are powered by the large four-pin Molex connectors. Should your PSU not already provide adequate number of 4-pin Molex ports, a Molex Y-splitter cable will be provided with your kit which will allow the power cables to reach all the boards.
Do not plug the extruder controller into the Y-splitter cable!
The extruder controller draws more current than the stepper boards. If your power supply doesn't provide enough molex connectors for everything, plug one of the Molex connectors from the power supply directly into the extruder controller, and use the Y-splitters to hook up the stepper motors.
There aren't many images because it gets very difficult to look at and determine what is going on, but it should be pretty straight forward. Make sure you read all the instructions, in fact, anyone building the bot should probably read them once or twice before even beginning. There are a lot of important tips in the text that aren't necessarily illustrated in the images. Take your time, read carefully, and the build should be pretty easy. When you get frustrated, take a break, come back to it with a fresh head.
—E_Roth_3
