I'd have thought what I said was pretty obvious. Find some place where people are about to die, chat to a Reaper, be very very polite.
And don't try to cheat him. Death is a seriously old dude, you think he hasn't had all the tries before? It offends him, it irritates him and if you want his help, that's not the way to go about it. Sorry to say it, but someone will have to die and stay dead. And humans do that all the time anyway, find a sick person or something. Really, it's not rocket science.