• Click on the Number under Menu Items.

• Next click Add an Item to this Web Menu

• From the drop down selection next to Menu Item, select one of the existing browse pages, web pages, or forms.
• Next select the Placement where you would like that item to appear on your menu. 
• Select the Level for the item and if you would like the item to be Collapsible. (see more on these topics below)
• Click Save Web Menu Item.

The level is the indentation of the item, where Level 1 is at the highest level, and Level 2 is a child item of Level 1.

Example:
Home (Level 1)

• About Us (Level 2)
• Contact Us (Level 2 )

You can change the level of a menu item by clicking on the gray arrows to move items in/out (Level 1, Level 2), and up/down (placement on the menu).

You can also set a Level 1 menu item to be collapsible.  That means that menu items below this item and at a lower level will be grouped under this Level 1 item. A collapsible item can be set to collapse by default, which means it will be collapsed when a visitor first views your web site. Note: Not all layouts support collapsible menus.

These are the layouts that support collapsible menus: Layouts 1,5,7 and 14.