Browse to Appearance / Menus in your WP sidebar
Create a main menu for your site by typing the main menu name and then clicking “Create Menu”
You will see a list of pages on the left.
Select the ones that you want to display in your main menu and click “Add to Menu”
Also make sure that you assign the menu to the right area of the site by going to “Manage Locations” or setting it to Primary Menu as shown below.
Here we show you which is the Main Menu and the Secondary Menu
You can create the secondary and footer menu in exactly the same way as above.