That LED driver would not be appropriate in this case. It's designed for single, 3W LEDs where using resistors would dissipate too much power as heat.
For your situation, you'd use the LED Wizard to calculate how to wire up your LEDs. Preferably you'd use a higher voltage source, such as directly from the power adapter you're using to power the Arduino, to drive the LEDs so you can put more LEDs in series. To switch this power you'd use a simple transistor circuit.