Hi NAVYA, I'm Erfan and I'll be happy to help!
Kindly follow the steps below:
Sign in at https://account.microsoft.com/.
Go to your profile info by clicking on your name at the top-left (next to your profile picture).
Scroll down and find "Account info".
Click on edit account info.
There you can update your phone number and email address.
Thanks!
I hope this helps :)