Plug and play - Headlight Relay Kits

Yes, to follow up dfnsmn34... so if I received this, how would I know how to install it? I see you say essentially plug n play, but how would I know where to attach it to, and maybe I can't see well in the photo, but it looks like some of the ends are just wire (no connectors)? Is it more obvious to hook it up than it looks in that pic? I'm not afraid I couldn't do it, just not sure I'd know even what to do.