I managed to destroy one Robosapien board by putting 6v where it shouldn't go

I'm going to use the 3.3v supply on the ez-b to power my other Robosapien, but now I'm a bit nervous about blowing it.

What resistor should I use to drop the voltage from 3.3v to 3.0v? I read up on Ohm's law, but it seems to depend on how many amps are being pulled. Is that right?

I need to run two cables from the 3.3v supply on the ez-b to the two 3.0v inputs on the Robosapien board.

Any thoughts?

p.s. electronics novice, don't underestimate how little I know