I have a 95 civic and a 91 crx with a d16z5 and i wanted to swap the motor to the civic but i dont know what to do, do i have to change the computer and all the wiring from the crx to the civic or can i just put the engine in without changing the computer.

You need an ECU for the engine to run right. Finding one for a '92-'95 (OBD1) may be a little hard.