90 Merc External flush

I recently got my motor back from a local shadetree mechanic who broke it down, fixed a burned out piston, put it back together and replaced some other corroded items. Runs great, but the external motor flush hose didn’t make it back in the install. Where does this hookup and how do I add this wonderful item back to the motor so I don’t have to piss the neighbors off late at night when I crank it up?

what year 90hp, cause a lot of the 1990’s didn’t have a flush port?

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Chris,
The one I have is a 2003 90hp 2 strk. It used to have the external flush.
Thanks