If you click on the narrow green button with the triangle next to the "Play" button you should be able to select your new profile from the list, it will then show up on the "PLAY" button and pressing that should start it.
If you click on the narrow green button with the triangle next to the "Play" button you should be able to select your new profile from the list, it will then show up on the "PLAY" button and pressing that should start it.