Make Required Field Empty

-- HikaShop version -- : 2.6.3
-- Joomla version -- : 3.3.1

Please excuse my wording as I'm not exactly sure how to explain.
Attached I have showing required fields the customer has to fill out during the checkout process. When the customer gets to this screen, information is already set from when I created the custom field.
What I would like is for these fields to be blank so if the customer forgets to fill it in, there's an error message.
How do I do this?

Thanks. How do I do this for the date? I currently am suing the field type Advanced date picker.

When I remove the date from the default value field and then save it, today's date populates. It seems to automatically put a date there instead of an empty box or a way for me to put "Choose Date".

Hi Nicolas,
I can't get the entire set up in one image so I've attached 2 files.