I forgot my security answers.
Forgot me security answers and in the "Manager your Apple ID" section, the change of security question is not been displayed for me.
Any help please?
That means that you don't have a verified rescue email address on the account, you will have to contact Support in the country where you are (and which is therefore the country on your account) to get the questions reset : If you forgot the answers to your Apple ID security questions
If you can't reset your security questions
If you can't send a reset email, don't have a rescue email address, or can't access email at your rescue email address, call us for help. When you call, you might need to create a temporary support PIN to verify your identity. After you reset your security questions, you might want to update your rescue email address.
If your country isn't on that ‘call us for help’ page then try this form to contact Support : https://www.apple.com/emea/support/itunes/contact.html
When they've been reset you can then add a rescue email address for potential future use : About your Apple ID email addresses - Apple Support
Or if it's available in your country you could change to 2-step verification : Frequently asked questions about two-step verification for Apple ID