Descriptions appear as text below the Navigation Label of your menu item. On the demo site, you can see descriptions in the “Mega Menu” submenu in both the “Descriptions” and “Images + Descriptions” columns. For example, “George R.R. Martin” and “Don’t feed the aliens” are descriptions.
The Descriptions field is actually a built in feature of the WordPress core Menu System. To set the Description for a menu item, click the arrow on any menu item to expand its settings.
If the Description field does not appear among the settings, you need to enable it. Click the Screen Options tab in the upper right of the Menus Panel. Then make sure that Description is checked under Show advanced menu properties.
Enter your description in the text box and click “Save Menu” to add your description to the menu item.
If your descriptions don’t appear, make sure that they are not disabled for that type of menu item. Go to the UberMenu Control Panel > Main UberMenu Configuration > Descriptions and make sure descriptions are enabled for your menu item type.