Missing important things! – iCircuit Review

I am trying to design a circuit that involves connecting LEDs. The LEDs that I have have a fwd voltage of 3V and current of 20mA. The problem with this app is that it does not allow you to adjust the value of the current for the LED, it is set to 1A. Also, how do you power up the arduino?
Review by Inkieto92 on iCircuit.