The templates available to you in Premium Web Builder are not modified through the your editor.  While each Builder template has different color options, no other modifications to the template itself can be made. 

Please note that if you use third party software to modify the code, InMotion Hosting is unable to provide support on any modifications that have been made using this technique.

Also, please be aware that if you modify the actual code for the template and you publish your site, it will overwrite the changes you made.  For help with customizing the look and feel of your Premium Web Builder website, please see our educational channel on Premium Website Builder.