Setting one page website is easy. Just follow the steps given below:

• First you need to set one-page website. Go to Admin > Appearance > Theme Options > Layout Settings and enable it by setting it as ON in One Page Site option.
  
• Now we need to create one page with different IDs and set link for it. Follow steps given below:
  
  
  

  Set link in Appearance > Menus like this:

  

Setting "Home" link for one page

You need to create a new custom link and add #tm-home as link. This will scroll to top when clicked and also activate Home link in menu.