Onepage Joomla! Template Document

1. Install Template Package:  Template package use for new website that you want to build content from zero without sample data, or using for your website with existing data. For install it, just download Template Install Package file and install it via Extension Manager (Admin > Extensions > Extension Manager, browser file and click to upload). Then, you just go to Template Manager, switch default template to this template.
    
2. Install Quickstart package: A quick-launch Joomla! Installation package that contains all the data and extensions to replicate the live demo. You just login to Customer Area and download Template Quickstart package, then see this blog instruction for more details how to install Quickstart package with Akeeba Kickstart file.

For onepage version, all content preset in single page. So, we can use normal Joomla! article with modules or SP Page Builder (see it in part '3-PARTY BUILD-IN) to create your content.

About menu, how can we identify for menu item when you click to scroll down? Please read this instruction to know how to do it.

Template Framework

Helix3 http://www.joomshaper.com/documentation/helix3/docs

Page Builder

SP Page Builder http://www.joomshaper.com/documentation/joomla-extensions/sp-page-builder

Extensions Build-in

SP Simple Portfolio http://www.joomshaper.com/documentation/joomla-extensions/sp-simple-portfolio

K2 Extension http://getk2.org/documentation

United Revolustion Slider http://www.unitecms.net/joomla-extensions/unite-revolution-slider-responsive/documentation

CSS Libraries:

Font Awesome http://fortawesome.github.io/Font-Awesome/

Bootstrap CSS http://getbootstrap.com/

CMS Using:

Joomla! CMS http://www.joomla.org/

If you have any question, please feel free to Submit Ticket Support at here.