I would assume you just take the bolt off, drain it, put the bolt back in and then fill it up.

But where is this bolt?

 

on the passenger side,right above the bottom corner...

 

its not a bolt, its a little plastic plug. it unscrews like a bolt... and it is exactly where he said it was^^^

 

^^^ Ditto and its technically called a petcock. That is of course, if you want to drain just the radiator contents. If you want to make sure you get at the stuff in the block's water jacket, there is a bolt behind the exhaust manifold on the block. I used this when I did a complete flush.

You probably should get a Helms, it will show you how to refill without trapping air in the cooling system.

 

For a full drain, it's a 19mm hex capped plug under the exhuast manifold on the pass side of the motor.