How do you kill yourself with Carbon Monoxide?

I need to know in strong detail how to kill yourself with Carbon Monoxide. Please, I've held this off for three years now don't give me answers like "seek medical help, get help, not worth it, people care" please, just tell me how. it's not 100% thought out that I will actually follow through. I just can't live like this anymore. my best friend hates me. the guy i'm inlove with told me I'm a waste of time. I was d, twice. I can't do it anymore. Please, just give me in full detail.