Plug the receiver in and place it on top or near your amplifier. Put batteries in the body pack transmitter and turn it on. Turn on the receiver as well.
Plug a short instrument cable into your guitar, and plug the other end into the body pack. Secure the body pack to your belt or place it in your pocket.
Plug an instrument cable into the out jack of the receiver, and plug the other in into your guitar amplifier. Turn your amp on.
Play a note on your guitar. If you hear it clearly, you are done. If it has static in the signal, change channels on your receiver. You may also have to change channels on your body pack. Refer to your owner's manual for exact instructions as every model is different. Once you have a channel with no static, enjoy the show.