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The main relay is located on the drivers side cab of the car, it is specifically located behind the pull cable for the hood release. it is mounted to the wall and has one electrical connector plugged into it. to remove use your hand to unplug your sensor and then use a 10mm socket to remove the relay from the mounting position. Before assuming your relay is bad check all of its post connections and all of them should sit at 0 when testing at 20 ohms i beleive. mine is currently out and you will notice that the car will not even turn over.
It is called a main relay as it controls the entire cars electrical service and distribution. At some stores it will be listed under "fuel pump relay" but do not be fooled by the people that work in these stores as they have almost no mechanical experience and do not pay more than 85 bucks for this relay, you may be able to find a temporary replacement at a junkyard.
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