Update the Navigation Menu

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  1. Log-in to WordPress.
  2. On the left Admin menu, navigate to Appearance > Menus.
  3. Select Main Menu (Primary) from the drop-down.
  4. Select the Page, Post, or Category from the left panel.
  5. Add to Menu.
  6. Drag-and-drop the menu item to the desired location within the menu structure.
  7. Save Menu.

Make a sub-menu two-row or three-row

  1. Login to WordPress
  2. On the left menu, navigate to Appearance > Menus.
  3. Expand the Screen Options tab on the upper right corner.
  4. Under Show Advanced Menu Properties, check CSS Classes.
  5. Expand any menu item to reveal the CSS classes.
  6. Enter the class name.
  7. Save the Menu.
The pre-coded CSS class names for Reykjavik child are:
two-column-menu 
three-column-menu
right-aligned