This step is actually optional but I would recommend you do it because it will insulate your electrical connections and make everything much safer. Follow these steps:
Using hot glue, glue your power adapter wire to the circuit board.
Find some craft foam and cut out a piece the same size as your circuit board. If you can't find any craft foam you can use cardboard.
Using lots and lots of hot glue fasten the foam to the circuit board. I glued in the middle, pushed on the foam, and then squirted glue into the edges.
And now you have a nice lighting module for the inside of your PC. Go to the next step to see some pictures of this in operation.