Vibration motor & Switch schematic

Hi guys I am very noob at all things to do with Arduino and I'm working on a project and I'm nearly there but stuck at how to add a switch.

I was wondering if someone could help me include a switch to turn my vibration motor on/off. This is the schematic http://tinkbox.ph/learn/tutorial/how-use-and-control-vibration-motor-using-arduino-uno I am using for the vibration motor, I'm just not sure how to incorporate the switch.

Thank you so much for any help!