In order to change the site template in SiteBuilder, follow the steps below:

• Log in to your SiteBuilder at www.yourdomain.com/zen (don't forget to replace yourdomain.com with your actual domain name, which has do be pointed to your SiteGround server);
• At the SiteBuilder index page, in the Actions section click the button with the yellow star;
• Click the new template you want to use for your site and press Select Design;
• You will get a confirmation that the template has been changed;