There are no emulators in Launchbox by default you have to choose the one you want to use and set it up. You said you followed and ETA Prime video, is it Retroarch you used for Neo Geo?
If it runs directly in the emulator and not in Launchbox some pics would be helpful of your settings.
In Launchbox go to Tools>Manage emulators and edit the emulator you are using for NeoGeo. Share a pic of the Emulator Details tab and the Associated Platform tab (make sure it shows the line with your Neo Geo platform listed).
Then choose a game from the Neo Geo platform you are having issues with and right click and edit the game. Share a pic of the Launcher tab and the Emulation tab.