Keywords: content management, site building, site configuration, user management, reports, comments, content, content types, post settings, RSS, taxonomy, blocks, menus, modules, themes, access rules, permissions, roles, user settings, actions, administration theme, clean URL, date & time, error reporting, filesystem, image toolkit, input format, logging & alerts, performance, site information, site maintenance, recent log entries, available updates, status reports, access denied & page not found.
1) After downloading and/or installing Drupal, you log in as uer admin and change the existing password. To do that after logging in with the existing password, you click Administer (in the navigation menu), then choose User management, the click Users, From the users names list, choose admin, then click the Edit tab on the top, enter the required data including the new password (twice), then click save.
For more details, click here.