Coolant drain plug on engine location

my Haynes manual for my '07 Sonata says in order to drain all coolant from the system I first open drain plug at bottom of the radiator (done that), then remove drain plug on the engine to drain coolant from the block. however the book doesn't show me where this engine drain plug is located. do I need to just disconnect a hose from the block to drain coolant within the block or is there an actual drain plug that's eluding me?

 

On '13 Sonata HYBRID how do I drain all coolant from both systems?
Drain plug at bottom of the radiator is easy to find.
(1) Where is the drain plug on the engine, to drain coolant from the block?
(2) Where is the drain plug on/for the hybrid unit?
PLEASE SHOW me where these drain plugs are located!

 

It seems to me that those drain plugs on the engine never come off anyway.
So, I have never bothered to find them.
Sorry.