Open the theme at the Home template.
Add several Section controls. These are the section of which the One Page website will consist.
Specify Section ID:
The Section ID is the anchor to which the page should scroll once you click on the menu item.
Add desired content into the Sections.
For example, you can add Drupal Region controls using Insert >> Drupal Region. Later you can add any Drupal blocks into the appropriate regions via Drupal Structure >> Blocks.
Add the Horizontal Menu control from Insert >> Navigation >> Horizontal Menu if it does not exist.
Note: If the Horizontal Menu control was previously removed, you should place the appropriate Menu Block into the corresponding region under the Drupal >> Structure >> Blocks.
Add "Smooth Scrolling" extension to the Horizontal Menu. You can also add "Fix on Scroll" extension if needed.
Enable "Scroll Spy" plug-in under the Themler Settings tab.
Go to the Drupal >> Structure >> Menus >> choose the menu >> Add Link >> in the Path you should specify the path in the following format e.g.:
NOTE: You should use the existing node id because Drupal does not allow creating menu links to non-existing nodes.
As alternative you can specify absolute path:
NOTE: The Drupal will save such link as
http://YOUR_SITE.com/#home#home. But in the front end you will see the proper link.