You may have registered with a username when you created your account. You can sign in with your username or email address.
You cannot change your username.
Your username is public information.
If you sell on Hip, your shop name represents your Hip business and is shown in your URL. Shop names can be changed at any time (but keep in mind that it may be confusing to your buyers if you change your name frequently).
To change your shop name, go Members Area > Store > Store Settings. Be sure to click the "Save Settings" button at the bottom of the page.
Your full name, which is optional, represents you as a person. Your full name can be your first name, or nickname you use in real life, and your last name. You can change your full name at any time.
To change your full name, go to Members Area > My Account > Account Details. Be sure to click the "Save Settings" button.