So if I cast to a Hud blueprint I made, where do I specify the object? Like how do I find that hud?
When you cast to your hud it will give you an output pin that is a reference to your hud. You can promote that pin to a variable to be saved and used for later. It will be located under variables section.
256463-
You define your HUD class on the GameMode or GameModeBase. You can get the HUD from the PlayerController.
Make a GetPlayerController and from that GetHUD. To get the specific type you created it has to be defined in Project Settings->Maps and Modes->DefaultModes expand “Selected GameMode” and there you have “HUD class”.