Q: I want to change my answers to the security questions.

If the email hasn't arrived after a few hours and isn't in a spam filter, you need to ask Apple to reset your security questions; this can be done by phoning AppleCare and asking for the Account Security team, or clicking here and picking a method, or if your country isn't listed in either article, filling out and submitting this form.

They wouldn't be security questions if they could be bypassed without Apple verifying your identity.