How to Add Navigation Menu

You can create menus in WordPress by visiting Appearance » Menus in your WordPress admin area.
This will bring you to the Edit Menus screen which is divided into two columns. The column on your left has your pages, categories, and custom links tab. The column on the right is where you add and adjust menu items.
Provide a name for your menu, e.g. ‘My Menu’ and then click on the create menu button
Next, you need to select the pages you want to add to the menu. You can do this by selecting the pages listed on the left hand side and clicking on Add to Menu button.
After adding pages to the menu, select the theme location where you want to display the menu and click on the ‘Save Menu’ button.