1. Go to Screens on the left bottom side of the column on your screen.
2. After you have selected the screen you wish to create these changes on, go to the Edit Details option on the far right of the screen.
3. In the Popup-box that appears, select the Single Layout if you have created a single layout or the Layout Schedule for more then one, depending on what kind of layout(s) you have created. Click on the drop down arrow to select the new layout(s).
4. Hit Save at the bottom of the box.
5. Click on the Reload option, to refresh you screen(s), and load the new layouts content.