Sorry for inconvenience you cant change email id or mobile number on career360 app as they are users identity which they are using and it is also verified by you.although you can make your new id with new email address to access the app.

To change any details within app of your profile typically you need to navigate to your profile settings, find the needed section you want to modify, and then enter your new input follow the steps it may involve accessing your account settings and updating your contact information.