If you cover 3 sides this helps them settle and this way they cant see out from all sides. You temps have to come up to the low 80's and humidity somewhere in between 70% and 80%, 80 is the highest the humidity should be. You could him/her a little bit more substrate also just enough so it can bury itself, if it cant bury itself completely it will make them feel vulnerable. This is one of there natural instincts that we should really give them the chance to do, they bury to get out of the heat and direct sunlight but also to stay hidden from predators. If the enclosure isn't in a low traffic room you should try and put it in one, the loud voices and stuff will scare the frog and if it cant bury it will make the frog even more stressed. All in all though I think the main problems are the heat and that the frog is still settling, get those temps up and fix the other things and your frog should come around. Also remember to use declorinator in the water for the dish and for expanding the substrate, and you can use distilled to mist the glass. To get your heat up you can cover 3/4 of the top with some tin foil and this will help trap in the heat and humidity. Also if its just a baby sometimes the big enclosure can stress him out so if you want you can divide the tank in half with some sort of divider or keep him in a small or medium sized kritter keeper till he grows into the bigger enclosure.