In Joomla go to 'Extensions'->'Extensions Manager.'
Install the horizontal_carousel.zip
This will install a component and a module for you in one installations.
Go to 'Components'->'Unite Horizontal Carouesel' under components.
Click on new and create a new carousel. On the left you have many configuration options u can play with.
Click save and close after you finished configuring your new carousel. Then click Edit items and the NEW button on top to add a new carousel item.Each carousel item should have a name and an image. You can add as many items as you like.
* The modules task is to put the carousel on the html page. You can put more than one carousel on any page, each carousel has it's module with it's settings.
Go to "Extensions" -> "Modules Manager". And publish the Unite Horizontal Carousel module that was installed.
Click on a module to go into edit mode.
In "General Settings" select a Carousel from the component.
Now select the module position (according to your theme), and asign the module to pages under module assignment.
Dont forget to save and close and your done! Good luck :)