Changing your website layout is very easy to do with the website editor on.
Click on the Layout drop down menu. You will now see the 4 layout options. Beside the name of the layout, there is a button to preview the layout and button to select that layout.
When you click on the preview button, another screen will open up to showcase the preview of the layout. Previews of the layouts are below. When you have selected the layout you would like to use, click on Select. After you click on Select you will need to confirm the switch.
After you confirm the switch, your website screen will refresh and you will be able to see your site with the new layout.
If you are a client who was put onto the new platform in it's beginning stages, you will not have access to switch to layout #4. If you do you will receive this error message. Don't worry, notification will be sent to the developer that you wish to switch to layout #4.