on the right side of vehicle (left in image) rear of battery forward of strut
There are so many things that may be preventing it from starting, including but not limited to: ignition switch, starter solenoid, starter, battery, any/all connections, etc..
Without knowing how capable the people there are, it's difficult to starting listing all of the things and ways of testing. Like does the starter solenoid click or not. If it does, does the starter click, sit clicking or is silent. What does it do if you jumper a wire from the battery positive to touch the starter positive drive cable on the solenoid, to see if the starter turns and engages. If someone isn't familiar with these and other things (as simple as having the engine turning/running with the hood up) they can get hurt.