To set up one page menu you need activate One Page Feature
1. Go to Apperance > Anaglyph option > Menu > Choose One page Mode
2. Go to Apperance > Menu
3. Create A New Menu by clicking on create a new menu
4. Add your menu items as custom links in left side menu
5. Put unique ID for sections, they generated automatically.
6. Choose "Primary Menu" as in Manage Locations