boil hops zero minutes ?

[TaylorBrewed]

So tomorrow I'm doing my first brew. BIAB style, Fat Tire clone from Austin Homebrew Supply. One of the hop additions says to add at zero minutes. So my real question is how long do I leave this style hop in my kettle. I built a hop spider that was in BYO so it will be easy to remove the hops. Do I leave that style hop in while I use my immersion chiller?. Sorry if this is a dumb question.

 

[amandabab]

add them, turn the heat of. or turn the heat off and add them.
either way is 0 minutes.
leave them in while cooling