I have a 1992 mx-3 and i replaced the transmission but i cant find a place to fill it with oil. Can anyone help?

 

I don't know specifically, but there are always two plugs in a manual trans. The first will be between half and two-third up in one side of the case and the other is the drain on the very bottom.
In my 3 series car, they are a 24mm hex, IIRC, and the fill plug is up front.

 

On the V6, it's on the front side, facing the radiator. It's the bolt right in the middle. 24mm seems about right. You basically stick a funnel and fill it until is starts coming out.

On the I4, If you have a pre 94, then locate your speedo cable. It runs past your battery and hooks to the filler on top of the tranny. Theres one 10 or 12mm screw holding it on. It has a small dip stick for filling.