Your Account Details in the Settings section of CatchApp allows you to change your name and email address associated with your account. This is useful if you get married and change name, or if you change email address, for example.
It also allows you to update your 'Shortcuts':
Google Hangouts ID
The only thing that you can't change is your mobile number because this is your main identifier.
What if I change phone numbers?
If you change phone numbers you should get in touch with us (email@example.com) to let us know and we will manually update your account to your new phone number.