If you would like to change your Hubble email address, please follow the below steps:

• Go to www.hubbleconnected.com:
• Once logged in, go to Account (Head icon);
• Tap the option "Change your email address or password";
• Make sure to fill out your password;
• And then your new email address (twice) and click submit.

If you would like to change your Hubble User Name: 

Unfortunately, it is not possible to change your Username. You can change registered the email address and password only. If you'd rather use a different Username you could consider to create a new account. Note that you will not be able to recycle the email address you are using currently.