The 2 wires are hooked to a Power Source and a Ground. It ususally doesn't matter which wires go where when it comes to this. You can search your owners manual for a fuse that is powered when the door is open (Dome light Circuit) is probably the best for your instance. You can purchase terminal ends or just strip the end of the wire to hook to power wrap it around the dome light fuse (not the best method). Strip the other wire (Ground wire) and install a terminal end so that you can bolt to an existing ground under your dash somewhere.
Hope this helps.