how ts save my apple id

If you mean that you've forgotten the answers to your questions then read the HT5312 page that you posted from, it has instructions for how to reset them i.e. if you have a rescue email address set up on your account then steps 1 to 5 half-way down that page should give you a reset link.

If you don't have a rescue email address 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 page that you posted from to add a rescue email address for potential future use