How do I setup the menu?
Go to Appearance→Menus. Click create a new menu.
Next, you will find these options on the left: 1. Use pages that already exist; 2. Add posts that already exist; 3. Create your own custom link, such as an external URL; 4. Use categories that already exist.
To add a page, post, or category to the menu structure, select the check box next to the item then click Add to Menu. For custom links, enter the destination URL, add a menu title and click Add to Menu.
You can change the order simply by dragging and dropping. You may also create a drop-down by dragging a menu item slightly to the right of the menu item above it.
Before saving, please make sure to select the check box under your menu labeled Primary Menu.
Click on Save Menu.