You have the game [mslug3h] selected. I said it doesn't show the supported games when the BIOS [neogeo] is selected... you have a game selected, not the BIOS [neogeo]...
Click on the BIOS folder on the left panel. But don't open it's subcategories. Just click on the BIOS folder and then click on the Neo-Geo [neogeo] on the middle panel. The Description is Neo-Geo. The ROM Name is neogeo. The Year is 1990. The Manufacturer is SNK. etc...
Do ya understand now?... or do I have to come over there and smarten you up