In order to install Live Theme Editor extension, please follow the instructions below.

  1. Go to admin > Extensions > Extension Installer and upload the Live Theme Editor extension.
  2. Go to admin > Extensions > Modifications and click on Refresh button.
  3. In admin > Extensions > Modules, install viethemes - Live Theme Editor.
  4. Go to the Live Theme Editor module to customize your theme
Here is the video which shows how to install the extension

Note that: If the extension does not work properly, please take a look at this solution first http://viethemes.freshdesk.com/solution/folders/5000253536.