One of the more common tasks when creating a website would be adding some text or an image to a module position. This can be easily achieved by using Joomla's Custom module.
- From your Joomla Navigation navigate to Extensions -> Module Manager
- Click New
- Select Custom from the list of available modules
- Add your text/image to the Custom Output field
- Set your module title and position
- Click the Menu Assignment tab and select the menu items you wish your module to appear in
- Click Save