My friends keep messing around with my car. They keep moving it with another Honda key, even though I have my key on me?

They are still able to move it. I wanted to know if anyone can help me locate the fuel pump relay on my car. I've looked everywhere online and I can't find it please help, I need to do that in the meantime, I plan on installing a kill switch soon

2000 Honda Civic DX

They will just kill the battery on you if the motor doesn't get gas.
Change the door locks.
They won't be able to get in the car to use the ignition key.

It is amazing what a person can do with a couple of floor jacks or even just brute force.
A bunch of us used to pick up cars and carry them to a new location when I was young, so I'm not sure your security measures will stop them. Now I can do the same thing with a floor jack by myself.