No Description Field in Menu to add Shortcode to

I tried adding the translator to the secondary menu but there is no description field in the menu item setup.

Instructions say:
Place the following shortcode into the “description” field, and modify it to display the language and navigation label of your choice:

[glt language=”Spanish” label=”Espa?ol”]

but no place to put shortcode.

How do I add the translator to the secondary menu?

The page I need help with: [log in to see the link]