This takes you to an administrative page where you'll find configuration settings for the whole site broken down into nine categories.

We will not attempt to step though each of these here, now, but instead visit them in the context of other chapters most notably Chapter 8, Configuration

Click on the Site information link in the SYSTEM category:

Use this link now to change the name of your site to My Drupal Agency or something similar. While you're there, add a slogan too. Then, save the settings and return to the site to see the effect of your configuration changes.