You should repot it with fresh soil, and make sure there is good drainage like Blowry said. Then once you have it freshly potted, water it thoroughally, and then don't water it again until you stick your finger down into the soil and it is dry 1 `1/2 inches down. Don't just go by the top looking dry, go ahead and stick your finger down in that dirt (it will wash off)
Most plants hate for their feet to stay wet and the biggest reason people kill plants is overwatering not underwatering. You can tell if it is underwatered because it will start looking wilty. Philodonderons aren't that hard to grow...you can do it!! Ivy's are super hardy too, if you are looking to branch out...stay away from the palms....picky, picky, picky!
