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You need to set the flash to slave and the same channel as the master. If the flash doesn't have this function it may be able to be fired optically. Set the master flash to low power and set the off camera flash to optical.
Two main reasons flash is used over continuous lighting.
Power. Lighting a scene for minutes uses much more power than lighting it for a fraction of a second. You may have noticed that most continuous lights need to be plugged in to a power supply, while most flash units work with small batteries. It may not make much difference if you're shooting indoors in a studio, but if you're out in the field and have to move around, it can get difficult lugging all that gear around.
Duration. A flash unit provides a very brief flash of light while a continuous unit is, well, continuous. A flash can freeze action much better than just using the camera's shutter. Try it yourself sometime: turn on the lights in the bathroom (and/or bring in your continuous light units) and take some pictures of a dripping faucet. Now turn off the lights and take some flash pictures of the same thing. See the difference?
It is the recycle of the batteries and, power setting of the flash. Lower power settings will allow us to shoot faster. So, check the power settings, run tests to see how long the flash recycles at lower power settings. You may find you do not need a full flash power shot.