Leaking of coolant inside

Hi.
i have an serious problem in my car. The floor of car in the driver side is found wet. When I removed carpet than I found tht it is wet from a gren liquid. The workshop is so far. So pls tell me how to fix this problem. When I saw from whr this was coming thn I get sign of coming from the bottm vent for ac air which is for foot. So pls tell me the solution.I can do it myself. If possible pls send the picture of tourbleshooting also