Horn installation - need help
 

The previous owner took out the horn for whatever reason. (I believe because it was a drift build and he saw no use for a horn) but since its my daily, I need to reinstall the horn. I cant find a good instructional video, I need to buy the horn(s) and then I was planning on getting a button to install in the dashboard. other than that I have no clue what I need to do, if anyone could give me detailed instruction on not fixing but completely installing a horn and wiring in a button for the horn or post a descriptive video that would be awesome! Thanks - Michael