I have no clue how to use this and I can't find any guides

All I get when I press start is just a black screen with a small x in the middle is there something I'm missing?

<img width="1600" height="720" alt="Image" src="https://github.com/user-attachments/assets/17c2dbda-f190-4d6c-a2e8-6c956fa93211" />