Adding a Joomla Module to your Site (or Adding a Sidebar to your Site)
A Joomla Module is a small piece of content that appears on every page of your site. An example of a module on a site is a menu. It is available from every page of the site and contains the same content so that a visitor can navigate around the site.
In this tutorial we are going to add a module to our site in a sidebar to display a special offer that we would like our site visitors to see no matter where they are on our site.
Click on the Extensions Menu on your administration panel screen and select Module Manager from the list of Options.

Click New on the Module Manager Screen and you will be taken to the Module:[New] Screen. Here there are a lists of modules that are available, because we want to enter information about our special, we would like to enter Custom HTML into our module so that we can add the information about our special offer.
 

Select Custom HTML and click the next button in the top right of the screen. This will take you to the Module :[Edit] screen where you can enter any HTML into the editor to format your special offer. In the top left of the screen enter a title for your module. I entered Special Offer. Enter the text you want in your sidebar in the WYSIWYG editor at the bottom of the screen. Format your text in the manner you would like. Click Save.

This will take you back to the Module Manager Screen, where you will be able to see your newly created module and that it is now active.

 
To see your new sidebar click Preview in the top right of the menu (the one that is just below the green bar at the top of the administration panel), this will open up your Joomla site to the front page. In the image below the sidebar that we just created appears below the menu on the left hand side of the screen, it has been highlighted in blue for illustration purposes. 

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