Step 2
On your "Start" layout, right click on the white space and "Insert New Object". Under "Form Controls" double click on "Button". Set the button's text to "Play".
Go to the event sheet for the "Start" layout. Click "Add event". Double click "Button". Select "On clicked". It should now look like this:
Click "Add action" for the new "On clicked" event. Double click "System" and then double click "Go to layout". Select the "Game" layout and press OK. Your event should look like this: