Hi NishantJ,

Thanks for taking the time to post your question in the forum! This specific forum is designed to handle questions about the 'yahoo.com' homepage, but you may find the information below to be useful.

You can definitely change your security questions at any time. This article provides the steps that you need to take to change your security questions.

If you are concerned about the security of your account, this article contains additional information on how to protect your Yahoo! account security. 

Hope this helps!