The instructions are kind of explained inside the OS.
Welcome to Epic OS Beta! This is a new Scratch operating system that I have made. It is nowhere near completion and there will be many updates to come. Enjoy! (Also, the username is used to say hello to you.) App List: Settings - Change settings about Epic OS, such as desktop background and animations. eNotes - Type up whatever you want! Brush - Draw whatever comes to mind! Timer - Use the mode you want (stopwatch or timer) and know how long you've been doing something! (Or set an alarm.) Pong - Play the classic game Pong in multiplayer mode! Extreme Clicker - Click for 30 seconds and try to get the most clicks! System Info - Find the version of Epic OS! News - Look at some news about Scratch! You can also shut down or log off, or use the Galactic eBot, your personal assistant!
