like some ppl here i could also flame how ppl do not search before posting.
for now, opus has three wires, red, black, and either white or yellow.
goto your local wiring store and pick up some 8 or 10 guage wire (2 lengths about 10 feet since you have a tiny car. one wire you will need a fuse on it about 30 40 amp fuse.
find a rubber grommet somewhere on your firewall to run the wires through from the engine compartment to where you will put the opus.
connect the black wire from the opus to one wire not fused and connect the other end to the negative (-) side of the battery.
connect the red wire from the opus to the wire that is fused and connect the other end to the positve (+) side of the battery.
connect the white or yellow wire from the opus to a fuse from the tiny little cars fuse box that has power when cranking. (usually the radio fuse will work).
ppl reading this be nice, he is a newbie. only thing sucks for him is the car he has.