In this tutorial, we will explore the Template Manager install Joomla. Templates are what Joomla uses to control how your site looks. You can download and install templates, modify existing ones, or given make your own. That's all beyond the scope of this tutorial, however
Go to Extensions… Then Templates Manager. This is the Template Manager. As you can see, all the installed templates are displayed here
The default template is marked with a star, as seen here
Hover over the title of a template to see a preview of it
Click on the template's title to view more details and options
Here, you'll see a description of the template, along with any parameters that have been coded into it. The parameters will probably be different, depending on which template you're viewing
Click [Edit HTML]. This page allows you to edit template's HTML. Change made here affect every page of your Joomla site. Make any changes you want, then click [Save]
Next, let's edit the CSS. CSS is used by modern website to control the colors and layout of a page. There are several files here. Some templates, such as this one, allow you to change the overall color scheme without changing everything else; that's done using the separate CSS files seen here. The bulk of the code for most templates, however, will be in template.css. Scroll down. Click the button next to template.css. Scroll back up. Click [Edit]. Just as before, Joomla provides you with a text editor with which you can change the contents of this file. Click [Save]
Once you're done with this template, click [Save] to go back to the Template Manager
To change the default template, click the radio button next to the template you want to be the default. Look to the right. Click [Default]. Notice, the star has moved next to the new default template
In addition to the Site templates, which are used for the public front-end Joomla, there are also Administrator templates
Click the Administrator tab to view them
Everything here works the same way as shown before with the Site templates
This is the end of the tutorial. You now know how to manage templates using the JoomlaTemplate Manager