By selecting the Appearance > Menus option from the WordPress admin sidebar, you can set the top navigation by creating a menu, and on the left under Theme Locations set the Main Menu dropdown to be your newly created menu and then click save. This will allocate your created menu to the header navigation of the theme.
The theme supports two levels of drop-down, so you can manage your menu items and allow for deeper navigation.
Menu Right location made for "Header Two Menus" type. After you assign a menu to this location, and use Header Two Menus at theme option or single page option, your menu will floated to right with primary menu on left. In other word you can have 2 different menus. If it not assign, the right menu will automatically replaced by social link.