Unfortunately, at this point of time, and in order to keep our system lean, we only allow users to add one email address and one mobile number (both of which become your primary). Hence, once added, you can not alter your primary email or mobile number. Nor can your snhyper-id be changed at this moment of time.
However, you can change your profile image/display pic from the profile menu :)
...and in case you need to change your First Name, Last Name, please drop us a request from the in-app help button on the right side of your app.snhyper.com web screen.