Browse to Appearance > Menus in the WordPress admin menu.
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” and setting it to Primary Menu as shown below.
