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The relay itself is next to the fuse box under the hood. There are many illustrations on the internet showing exactly where. The better way is to jump the stater solenoid.
Jim...Sorry but some DIY methods are not the best idea and as such I can't really post that answer. You said you want to "spin" the motor. So, the proper way to do that without the possibility of indirectly causing other problems is to do that at the starter solenoid. They actually have tool to jump the starter solenoid but not specially for jumping a stater relay.