Hello - I just wanted everyone to know that your default username and account name is whatever email address you sign up with. In order to update your profile name, you must change it in TWO Areas:
Step 1: Go to your Profile and click the "Edit Profile" to the right of your picture. You can change your User Display name to whatever you want, and then click "Save".
Step 2: Go to "My Account" page and change your URL page, your First and Last Name, and your contact email address and click "update info".
ETA: It's come to our attention there is a bug that is not allowing members to update their community page URL at the moment. We are working with our webhost to get this resolved. Thank you for your patience.