You'll need to make a Loader layout. Make a blank layout for the moment, and place it above all layouts, naming it Loader. That makes sure it loads first. Then in your project properties (click off any object and you can access it on the left of your screen), set Use loader layout to Yes. Once that's set to be used, set the following events for it's Event sheet:
System -> On loader layout complete
---- System -> Wait 2 seconds
---- System -> Go to layout
Select the next layout which contains your game, and boom, game loads!