How can I step into the engine code when debugging a game?

Could someone please tell me how to debug into engine code with shooter game project. I want to be able to step into the source code of UE4 while debugging. Because some time I really don’t know what’s going on after I called a function from UE4. Thanks a lot.

Download engine source code from github. Compile as Debug Editor. Set breakpoint on function you want to investigate. Launch game and step into engine code.

Thanks, I did that. But now I can only run the editor compiled with Development Editor. Once I compile the engine and the game code with Debug Editor I can’t not open the Game Project any more, I got an error ‘can’t find loadscreen module’