Your profile is the personal half of your settings. Your firm's settings are separate, see firm branding.

Name and picture

Set your display name and upload an avatar. Your teammates see both, on assignments and in the activity record, which is what makes a shared firm feel like people rather than rows.

Signing in

You can sign in with Google, or with an email and password. Whichever you use, turning on two-factor is the single best thing you can do for your account. See two-factor login.