My horn does not work on a 2007 Toyota Corolla. on 2007 Toyota Corolla

I followed the wires and the wire leading from the horn is unplugged. It looks to have a male/female adapter on the end. I have crawled all up under the car and I can't seem to figure out where to plug it back in at. I don't know a lot about cars but this looks like a simple plug in if someone could just tell me WHERE to plug it in. Thanks!

Asked by for the 2007 Toyota Corolla