1994 Honda Accord ex

I just got a this used car about 3 months a brand new transmisson on august,18,07 my cousin said i had a leak so i said okay, he said ill fix it so he did the next morning i couldnt go reverse what i think he did was tightin the gear bolts on the the transmissons, i just need to now how to adjust them back to normal

Eh? Ask him what he did.