Project USB Host Connection

Projects General Guidance
1

I have been trying to use the disconnect functionality of USB host shield mentioned in the below mentioned article

http://www.circuitsathome.com/camera-control/simulating-cable-disconnect-on-usb-host-shield-2-0/comment-page-1#comment-12089

I am trying to figure out the exact connections of the mosfet but I am confused about the exact connection points.

I have been trying to understand the connections. What I have got out from the picture is that drain is soldered to one of the 3.3V pad and source is connected to one of the 5V pad. Is it correct ? I am getting confused when it is mentioned that drain is connected to VBUS. Is drain connected to VBUS or 3V pad. Is this setting letting 3.3V operate the platform or not ?