How do i install it it was a hand me down with no instructions

Http://dl.owneriq.net/a/a44b260d-f7bb-4ae7-bd9f-5a4722cb9427.pdf

in general

the positive terminal is connected to the positive of the battery

the negative terminal is connected to a metal grounding point on the car ( find a metal spot on the car to connect the negative terminal of amplifier)(do not connect it to the negative side of the battery)

the remote terminal connects to either the remote line from the back of the radio blue and white wire

if the radio does not have a remote wire then use the red wire which is the acc (check this against your car wiring)

the speakers are simple connect the positive of radio to positive terminal ect

and the input comes from the radio as a phono jack connect that to the input of the input of the amplifier right left ect ect also if the radio has only left and right then you need a splitter for the phono cable because your amp is 4 channel

if the radio does not have phono jacks then you need to take the output that usually goes to the speakers and route them to the amp and attach pho no jacks on them