Umm.. on your car, I don't know. But there is only one big large rubber line going to the MC from the engine.. i'd say that'* the vacuum line. Pry it off at the MC, get a funnel, and pour it in with the engine running. Pour in a little bit at a time, until you have only 3/4 or 1/2 of the bottle remaining [depending on how long it'* been since the last time you "seafoamed"]. If this is your first time, I recommend using half the bottle in the vacuum line. Then put the rest in your gas tank. I would put it in with a 1/3 or less of a tank, that way it is more concentrated. Seafoam isn't as harmful as injector/fuel system cleaner, so don't worry about it harming your fuel pump.
'89 SSE - GX3 -190k, 155k on body - Back for another ride.