To turn on the fan for extra drying time, please ensure your Nimble is in Capsule Ready mode (left and right buttons are solid white).  The extra fan cannot be turned on in the middle of a manicure session and can only be activated once a manicure is wrapped.  

To turn it on, short press the center unlit Paint button.  To turn it off, repeat.  The fan will stay on until you turn it off.