The template used to specify the layout of the administrator back end of a Joomla site. The Back-end Template controls the way your website's administrative tasks are presented for controlling management functions by a Joomla! Administrator. These would include common tasks such as: user, menu, article, category, module, component, plugin and template management.
01. Hardware selection
Every slide includes a background, which can be a picture or solid color.
Step 1
To change the background click on the label bar and in the layer window select the style tab.
Step 2
Choose a source from the background top tab then upload an image or pick a background color.