Basic information about the site can be defined in the site information page.

Administer > Site configuration > Site information

Here you can define the site name, slogan, mission and footer.

Anonymous user is a user who posted something without logging in. It is usually not good idea to allow anonymous users to post on your site. You would soon find yourself under attack from spambots. If you do allow anonymous posts, the name you specify here would appear as the author. I usually change this field to a blank screen.

You can also define the address of the front page. By default, it is node which lists the latest published articles. Very often, we would like it to be something different. To change it, simple type in the address of the desired page. Do not, however, type in the url alias.

Site information is often theme specific, so you need to configure your theme as well:

Administer > Site building > Themes > Configure

Themes are website designs. Drupal offers you a wide variety of themes to choose from. Changing a theme (look and feel of the entire website) is as easy as changing gears in a car. You can either use global configuration which affects all themes or make theme-specific configuration. Here we would mind ourselves with global configuration.

Here you define what would be visible and what would not be. In the Toggle display section, you define whether you want to make the logo, site name, slogan, mission, or shortcut icon to appear. Shortcut icon is the small icon which appears before the url. In the Logo image settings sections, you can upload your logo. The default logo is the logo provided by the theme. A similar section, Shortcut icon settings also exists for shortcut icon.

The user information is the name of the author, date and time of publication of a post. If you check the checkbox, this information would appear. I usually do not like to show this information and therefore uncheck these boxes in the Display post information on section.

The current theme's configuration overrides the global theme configuration. If you wish to use the global theme's configuration, click on your current theme (garland in my case) and click on Reset to defaults to use the global configuration.