I forget my answer of two security questions, there is a typo error in rescue email address. How to resolve this so that I can use my Apple ID for online shopping?

You won't be able to change your rescue email address until you can answer your questions, you will need to contact Support in your country to get the questions reset.

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

When they've been reset you can then use the steps half-way down the HT5312 page that you posted from to correct your rescue email address for potential future use