Customize Menu
To customize the menu and megamenu please login to wp-admin and navigate to Dashboard -> Appearance -> Menus and follow the following steps:
Create a Menu
- Create a new menu and name it - Main Menu
- Click the Create Menu button. 
- Add pages to your menu from the Pages Panel on the left 
- Select Primary as Display location and Save the menu 

Edit the Menu
- Select a Menu to Edit 
- Rename menu name as you wish. If you want to add more menu items, choose them from the left and hit Add to menu. 
- With each menu item, you can rename or drag to make it sub-menu. 
- Finally to hit "Save Menu" when you finish editing. 
