how can i change my email verification questions
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You must remember three answers for respective questions for the apple id signed in the Mac / iPhone / iPad that is used .
Go to iforgot.apple.com and enter your Apple ID address and click on continue .
Check the box of I need to reset my security questions and click on continue .
Enter the Apple ID password and click on continue .
Check the box of answer your current security questions and click on continue .
A single question will be written in the field , enter the answer for it in the next field .
If you click on drop down arrow in the field you will view all the questions when the Apple ID was created , it’s your choice select any one of them and answer for that question .
And click on continue .
A pop up window will appear click on drop down arrow in each field , select the desired question and type the answer in the next field , apply the same procedure for rest of fields and click on continue the security questions are changed .
Take a screen shot of questions and answers and save them in notes application or note in a diary for your records .
See the article Change your Apple ID security questions - Apple Support