Modules are used to display various information and interaction on your website such as displaying the menus, small amount of contents, a signup box on the side, or a side menu. Basically, almost any form of presentation outside of the main articles on the website is displayed by modules. And modules are generally quite useful when you need to have small amounts of contents displayed at several different positions of the website.

To manage your modules, go to "Extensions" > "Modules Manager" at the Main Menu.
You will be directed to the Module Manager page.

To create a new module, click the "New" button on the top right corner of the screen.
You will be directed to a page which shows many types of modules, as shown below.
The more common types are: Custom HTML, Menu and Latest News.

Select the type 'Custom HTML'. This type allows display of small amount of contents.

The following information is displayed:

Title: This is the title of the module. It is editable and will be displayed on the Front-end of your Web site if you choose so.

Enabled: This tells you if the module contents will show on the Front-end of your Web site. Click the button to toggle the published/unpublished state.

Position: This shows which template positions the module will be displayed. Some common template positions are: User1, Left, Right, and Top.

Menu Assignment: This shows on which pages the module will be displayed. Options include 'All', 'None' and 'Select Menu Item(s) from the List'. Select 'All' if you want this module to appear on all pages of the website or ‘Select Menu Item(s) from the List’ if you want the module to appear only on web pages that you choose.

Custom Output: Enter the content that you wish the module to display.

Click 'Save' when done.