Log into your GoDaddy account.
Click 'Domain Management'
Select the names you wish to change.
Choose the 'Contact' option.
-Here you can change Registrant/Admin/Technical/Billing or all of them.
Another way to change whois for your entire account:
Log into your GoDaddy account.
On the left side of screen options choose 'My Account'
Next, under Preferences, choose 'Account Settings'
-Here you can change the whois info for your entire GD account.
Additionally, you can contact GoDaddy Customer Service at 480-505-8877.
-Regards