It takes a lot of trial and error to get a neglected (and luck!). Because basically you get an egg (most eggs work) and let it run down to a mere minutes until death. When it gets to say 10 to 5 mins. of death you put it in emergency rooms of fansites. And if you're very lucky the egg will turn into a neglected egg. At that point you'll want to either try to hatch it (very hard to do) or abandon it to a friend so that it gains an extra day (giving you enough time to hatch it) or use the earthquake action that Earth dragons have (so that it hopefully is forced to hatch).
I basically got mine by putting the egg in ERs at 8 minutes until death. At 4 mins I put it in more ERs. I got it to turn into a neglected egg at around 30 seconds left. I abandoned the egg to one of my friends who was waiting for it. It gained time so she then abandoned it back to me where I hatched it and it inevitably grew up.
I hope I make sense. If I don't I'll further explain. :]