You can use default WordPress menu system for create menu items. Promobile have three extra area for menu configuration.

1-) Icon name: You can add an icon to the menu. Please copy icon name from FontAwesome web site and paste that area.

2-) Divider section: Please check this box if your menu item is a divider (menu header)
3-) Close button: Please check this box if your menu item is a close menu link.