Q: Plz I have forget the security number

We are fellow users here on these forums, you're not talking to iTunes Support nor Apple

What 'security number' do you mean, and what do you mean by 'new word for the iTunes card work with me' ?

If you mean that you've forgotten the answers to your security questions then 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 iTunes Support / Apple in your country to get the questions reset.

Contacting Apple about account security : http://support.apple.com/kb/HT5699

When they've been reset (and if you don't already have a rescue email address) you can then use the steps half-way down the HT5312 link above to add a rescue email address for potential future use.