Your Sketchfab username is the unique identifier that appears in your Sketchfab profile URL. It will appear with this structure: sketchfab.com/username, where "username" is replaced with your choice.
If you'd like, you can change your username once every 30 days in your Profile Settings.
Requirements:
Usernames must be 30 characters or fewer. Letters, numbers, and ./-/_ only.
Usernames cannot contain spaces.
NOTE: Changing your username will change the URLs of your profile pages and collections.
Changing your username will not affect your model URLs.