Configuring your own security question is for your account security.
You will be asked by your own security question when your verified e-mail address is invalid and you are going to change it.
How?
To configure your security question, step as 1, 2, 3, 4:
1. Sign in to My iAbrasive
2. Under "Account Setting" section, click "Configure Security"
3. Choose a question from the dropdown menu and enter your answer
4. Complete the form and click "Submit"
How to change my security question?
To change your security question, step as 1, 2, 3,4:
1. Sign in to My iAbrasive
2. Under "Account Setting" section, click "Configure Security"
3. Then Answer your own Security Question
4. Once you answer correctly, configure your new security question.