add coolant to the over flow bottle any time you want it makes no difference .
undo the radiator drain and pull the rad cap off . leave it for a while . it will all drain out .
surely you can do a search and a topic will even show you pictures where the bleed piont are . one is at the front on the leff kinda near #1 injector . cant remember if you have to remove "neo" cover as mine is permenantly off . rear one is about where the other end of the intake manifold is . they stick out like dogs balls because they always have a shiney gold sticker with red "do not open when hot" on them .