Hi Diana Hoh,
Update: If you are new with our template and Gantry5 framework, I recommend you check our quickstart package first to see whole settings 🙂, the documentation for quickstart installing here https://joomlead.com/joomla-tutorials/how-to-install-joomla-quickstart-package/
Gantry5 documentation : http://docs.gantry.org/
Check our gantry5 particle page to see how to implement any Particle for joomla template
Note: If you didn’t start with our quickstart package, only template itself, I can provide the Unite slider extension so You can install it for joomla and create a slider by yourself.