How do I create a drop-down menu?

To create a submenu, from your WordPress dashboard go to Appearance > Menus.

1. Select the Menu you want to edit. (If you only have one menu, it should already be selected by default)
2. If not already added, add the menu item you want to add to your drop down menu.
3. Once added, place it under the menu item you want to be at the top of the drop-down and indent it.