The "Settings" tab of your account page allows you to change your display name (e.g. "Demo User"); your username never changes (e.g. "demouser").
Here, you also change your password, update your email address, and choose whether or not we can send you automated notifications about your account. We recommend keeping this checked so you can find out if your credit balance hits zero, or if someone comments on an Algorithm you've created.
That's all for this section. Next, we'll dig in deeper on how credits work.