how do you change, your security Questions, if you forgot them and you don't have a rescue email?

If you don't have a rescue email address (you won't be able to add one until you can answer 2 of your questions) then you will need to contact iTunes Support or Apple to get them reset

e.g. you can try contacting iTunes Support : http://www.apple.com/support/itunes/contact/ - click on Contact iTunes Store Support on the right-hand side of the page, then Account Management , and then try Apple ID Account Security

or try ringing Apple in your country and ask to talk to the Accounts Security Team : http://support.apple.com/kb/HE57

When they've been reset you can then use the steps half-way down this page to add a rescue email address for potential future use : http://support.apple.com/kb/HT5312