H.I.D INSTALLATION PROBLEM

I have a hi/lo H.I.D and i need to install a relay,can someone tell me how to install that???

In my instruction they ask me to install relay AND diode,
diode? what kind of diode? and where can i bought that?
how to plug that? i'm lost:shrug:

I can't take the + direct from the batt,i think i have to pass via the light switch...right?

Any help is appreciate.
 
the relay comes with the hids.. maybe in a plastc bag. . Check your box for a black box thing that you can plug into the wires.

Actually did you get new headlights? Is this the wire harness for headlights or directly to the hids.