There is a standard flash mount on the D5600 which this flash will attach to. The flash has a small toggle switch to turn the flash on. In default mode, when you take a picture, the flash will automatically go off. It also reads the exposure settings from the camera - so nothing to do there.
Separately, this flash can also be set to Master mode - this flash SB700 comes with a remote which can be used as the camera remote when taking a picture when set to Master mode.