If you are working in Preferences > Forms
in your account to make a form for a site product or checkout page, it is difficult to assign a blank value as a default value on the form. You can use the html special character for non-breaking spaces to add a blank entry to your form's drop-down options. Enter " " exactly as it appears and without the quote marks, as the first option under Default Information
for the drop-down form field. More information about forms can be found in the chapter on Forms
in the documentation.