If a cham is used to hunting his feeders it takes them a little while to get used to the dish. If you just don't put any crickets in he will start using the dish in a few days usually. All of my chams that cup feed hated it at first, the tric for me was to start them with their favorite feeders in the dish and to have it mounted in the upper half of the enclosure somewhere near their favorite perch. Once you get him to eat his first super those will be like a drug for the chams. They are literally like grack for my chameleons because they are a beetle larvae and larvae are generally fatty. I have a few that refuse to cup feed though. I had three food cups in their cages and they didn't eat for 7 days each, they are all 3 adults so I was not starving them as they can go without food for awhile if they have too, so i have gone back to the free ranging/hand feeding with them because I didn't awnt to make them hunger any longer. Eventually they would ahve eaten the bugs out of the cups but it wasn't worth them going hungry any longer just to save my lazy self a little time. It has been easier for me to get panther chams in the 3-7 month range to cup feed than it has adults, I don't know if thats true for everybod. Good luck.
Just