How to Change Password Security Question

PayPal
To update your security questions on PayPal, log in to your PayPal account at paypal.com and click on 'Edit Profile.' Next, click the 'Edit Password' link under the Account Information column on the next page. Select the radio button that corresponds to your secret questions and click 'Edit.' Enter your current password to verify your identity, then choose what secret questions you want, as well as their answers. When finished, click 'Save,' and you'll receive an email notification informing you of your selected changes. If you ever receive this email and you did not change the questions, you should contact PayPal, as your account may be compromised.
Gmail
Changing your Gmail security question is a straightforward process. To start, go to gmail.com and sign in to your account. Once signed in, click on 'Settings' at the top of the page, then select the 'Accounts and Import' tab. From here, click the 'Google Accounts Settings' link, go to the 'Personal Settings' section and select the 'Change Password Recovery Options' link. If Gmail requests you to enter your password, do so to verify your identity. Once in the 'Security Section' portion of the page, choose a security question that you wish to be associated with your account and type the answer into the appropriate field. When you have finished, click 'Save,' and your security question and answer will be updated immediately.
Yahoo Mail
Yahoo password changes are easy to perform. Using http://help.yahoo.com/l/us/yahoo/acct/info/sqachange.html, the link that Yahoo provides, log into your account. You will need to fill out the form entirely, including the current security question that is on file. Once you have filled out the form, click 'Submit' to reset the security question. If you have forgotten any of your information, you will be unable to reset your security question and may have to open a new account.