need help wiring a dvd touchscreen

i got a kenwood kvt-817dvd and i need help installing it n a 94 firebird formula any help is good i got a amp and subs also running to it but i need to figure out what wire goes to what .... there is some thing called a brain i belive that is under my seat that has some wires running to it .. what do i need to connect and will it work when im driving ?