The Admin tab has four sections where you can configure the settings related to your account...
Public Profile: The settings in the user profile are used for printed, email and text quotes as well as the website quoting plugin. In a nutshell, the settings here will be shown to the public.
Account Profile: The settings in the account profile are used internally for all functions related to your account.
Billing Information: The settings in the account profile are used internally for all functions related to your account.
Logo / Co-branding: The logo creation tool can be used to create a simple logo for your printed quotes and website quoting. If you have upgraded the web plugin, you can upload your own logo.