Change Skybox

Hi! I’m working on a School Project which consists on developing a Roller/Puzzle game.
I wanted the game to take place in the Sky, just like this one: Ball Resurrection Android Gameplay Trailer HD - YouTube
Is there any way I can invert the default BP_Sky_Sphere so it can look just like the video above?
I could easily change the sky in Unity Editor, but in Unreal is kinda of a headache since I have to mess up with the Blueprints.

Any help?

Thank you