How do I add link to a drop-down menu on Upfront - Spirit Theme?

Hello!

I am currently using the spirit theme and I am trying to "edit link" on one my dropdown menus in the navigation.

I can easily change the link on the tier-1 menu items... but I am unable to edit the link for tier-2 or tier-3 navigation items. When I right click.. there is a contextual setting to 'edit URL' but nothing happens when I select the setting.

Sincerely,
Calvin