Need help casting to a game manager in blueprints

Hey guys

I am currently learning unreal engine. I am using mostly C++, but also using Blueprint to create bindings for my UI. I have a C++ class called PopulationManager that inherits from AActor, which contains several variables that I need to access to make the necessary bindings. To access these variables, I understand I need to cast to PopulationManager, but the problem is I have no clue what to use to cast to this. I have already used cast to GameModeBase, using the GetGameMode node. But what can I use to cast to the PopulationManager?