1. Go to Appearance → Menus in your dashboard.
2. Under Add menu items, click on Categories:
3. Tick the boxes for each new category you wish to add to your menu.
4. Click Add to menu. Each of the categories you selected in the previous step will be added to the menu.
4. If you wish to change the order the menu items appear in, click and drag each one to the desired spot. You can also create drop-down menus. More on reordering menus.
5. Click Save Menu at the bottom of the screen when you’re done.