Add main, lateral and bottom menu
Please select the “Appearance >> Menus” item, then select “Create a new menu,” and write the name of the main menu inside the textbox, for instance: “menu main top.” Now that the main menu has been created, simply add the pages (on your left) inside the newly-created menu through the “Add to menu” button.
Basically, only in the initial stage, you create a menu and place it in its position, such as: Main Menu, Main Menu Lateral, Footer Column 1 Menu, Footer Column 2 Menu, and Footer Column 3 Menu.