Let's Make Robots!

Picaxe Problem Sensor Cable

I got some trouble over the first project.

Hello I am trying to do the first project of the robots, http://letsmakerobots.com/start I bought all the things needed but I got some trouble I dont know how to connect the sensor, its exacly the same as the project uses. I am getting lost at the part that says that because he refers to some other kind of sensor and than there is no image to understand how.