The first step of creating our menu is to open the WP Menu Editor.
To start, create a Menu Navigation. You just need to enter a "Menu Name" and click "Create Menu"..
Once you've created the menu, the your next step is to select the Menu as the "One Page Menu" under the "Theme Locations" if you want to display this menu on Main Page, or if you want to set the menu as Top Menu for external pages - like blog. After you've selected your navigation from the drop-down, click "Save". This is what links your newly created menu to the theme.
The final step is adding links to sections into your newly created Menu. The Main Page is created from smaller sections and each section is in fact a page . Clink on Pages and click "Add to Menu" - this way the section is displaye on Main Page. Each menu items has a dropdown from where you select the section and menu link relation.
Once you are done customizing your menu, click "Save Menu".
Under each menu item you have a drop down from where you can select the menu type like this