These wireless microphones can be connected to a smartphone, computer or video camera using the appropriate cables included in this kit.

image from Rode manual

image from Rode manual
Press and hold the power button on the receiver (2). To pair your microphones to the receiver, press and hold the power button on the microphones one at a time (2). Once turned on, they will automatically pair to the receiver. This should take a few seconds.
Clip the microphone near your subjects sternum. You may need to play with the direction of the mic and proximity depending on environmental factors such as wind.