Final answer:
To add a dropdown menu in WordPress, access the admin dashboard, go to 'Appearance' > 'Menus', create a new menu or edit an existing one, and arrange menu items in a hierarchy. Save your changes to apply the dropdown menu.
Step-by-step explanation:
To add a dropdown menu in WordPress, you first need to log in to your WordPress admin dashboard. Once logged in, navigate to 'Appearance' and then click on 'Menus'. Here, you can create a new menu or edit an existing one. To add items to your menu, you can select pages, categories, or custom links from the left-hand side panel.
To create a dropdown menu, drag a menu item slightly to the right of the item above it to establish a hierarchy. The item that is indented will become a submenu item under the parent item above it. Remember to click 'Save Menu' to apply the changes.
Moreover, WordPress themes often provide additional customization options for menus. Check your theme's documentation for more specific instructions tailored to its unique features.