I can't remember my security question answers

If you have a rescue email address (which is not the same thing as an alternate email address) set up on your account then steps 1 to 5 on the page that you posted from should let you reset them : go to https://appleid.apple.com/ and click 'Manage your Apple ID' on the right-hand side of that page and log into your account, then click on 'Password and Security' on the left-hand side of that page and on the right-hand side you should see an option to send security question reset info to your rescue email address.

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 won't get the reset option - you will need to contact iTunes Support or Apple to get the questions 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 'Forgotten Apple ID security questions'

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 (and if you don't already have a rescue email address) you can then use the steps half-way down the page that you posted from to add a rescue email address for potential future use, or you could change to 2-step verification : http://support.apple.com/kb/HT5570

i'm tying in the answers to my security questions, but it's saying incorrect. How can I change my questions to verify it's me.

Read this page : If you forgot the answers to your Apple ID security questions - Apple Support