2000 Ford Escort How do I change an oil hose?

I ´m on the freeway having ride just 5 mile from home and the car lost acceleration. I could pump on the gas, the engine was still on but it would just sound as if I was trying to accelerate it on neutral. I parked it in the right shoulder, poped the hood and went to check the oil level. I knew that it culd not be anything related to that, since I ´d checked on it to days prior to the inccident and yhe level was acceptable. The surprise was that there was virtually no oil in there. It was all on the floor, anderneath of the car a huge pudle of oil and, a llong drag behind of it. Right way I recalled of a friend of mine telling me that I would need to eventyually change a hose that was very dy. 2 months passed by and this hapened. Now I don ´t actually what ´s this hose name, where ´s it located and how to I can change it myself?