Changing security questions

it means you've tried too many time wrong , you didn't provide more information in your account such as rescue e-mail address or credit card information or provide your phone number to be trust , you need to contact apple support phone and make sure to remember it

there is a contact link.

Apple ID Support

Apple ID Support (2) 

Apple Support by e-mail or chat    Work through the screens to get a chat option.    

Apple Support using Twitter

Or fill out and submit this form.          The form is for iTunes, but it will get passed to the ID Support section.