Read my hatchling page for proper care at
http://www.fishpondinfo.com/hatchling.htmIt should answer most of your questions.
Pellets are not good to entice baby turtles to eat. Live foods are the way to get them to eat. I suspect that you were given some sort of cheaply made turtle pellet ball stuff that's really not very nutritious at all. Since the person who sold the turtle to you did so illegally, that's not surprising.
Turtles can go days without eating when that age but after a week, I would worry. It's not uncommon for most animals at some time to eat their own feces. In some cases, they are just starving or trying to get more nutrition out of them. In other cases, it's more a matter of them just trying them out.
I hope that Jing starts eating. If you can get live blackworms at an aquarium store, those are the favorite of baby turtles. If Jing won't eat those, he/she is probably very sick and needs to see a vet.
Good luck!