Actually, until it roots, keep it mostly dry, in sandy or loose Unfertilized soil. Pure sand works well, and if you can someplace where theres concrete and sun, put about 2 inches of sand max in a pot, place that on the concrete (or asphalt) and add some water maybe once a week. The concrete 'bed' will help warm the sand and promote growth. Heat, or more specifically, warmth, is a huge help in getting these plants to start rooting. But, if youre starting over, cut off the yellowed portion of the plant, add some rooting hormone, if you have any, and let the fresh cut 'harden' or dry for at least one week. Then, wet the end again, add rooting hormone to the cut, and place in your pot. You want fully draining, sterile soil until you get your roots. Remember, youre not trying to get a plant to grow, youre trying to get a severed piece of plant to realize it's no longer part of the host organism, and that it needs to develop its own rooting system to survive.