Q: I forgot the answer for my security question ?

You need to ask Apple to reset your security questions; ways of contacting them include clicking here and picking a method for your country, phoning AppleCare and asking for the Account Security team, and filling out and submitting this form.

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

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i dont know my security questions?

If you have a rescue email address on your account then the steps half-way down this page will give you a reset link on your account : http://support.apple.com/kb/HT5312

If you don't have a rescue email address (you won't be able to add one until you can answer your questions) then you will need to contact Support in your country to get the questions reset : http://support.apple.com/kb/HT5699