1- Creating and activating the menu

You go to the dashboard, navigate to Appearance –> Menus –> type the name on Menu Name box and click Create Menu (you can ignore this step if you have already a menu)

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Then, check the box “Primary Menu” to assign the current menu as the menu bar at the Top.

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2- Adding the items

Just simple navigate to the tabs such as Pages, Posts, Categories… to add the items to the menu

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To create a dropdown menu for categories, you add the items from Categories tab to the menu, then drag and put them like this:

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Note: To create the categories, you navigate to Posts –> Categories.

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Be sure you save changes when you finished.