Footer section is where you can add your logo, footer links (like Terms and conditions, Sitemap and so on) and the copyright. The footer, in this theme, is built as a block. You can find it by going to Structure > Block > Configure.
Change footer logo
Go to structure > Block > Configure.
Read Edit block for more information.
Change footer links
If you want to add/edit/delete any menu item, go to admin/built/menu and select Secondary links. See Manage menu.
Change copyright
Note: If you purchase the theme, pleas make sure you have permision to remove the copyright. If you are using our free themes, keeping the copyright is a great help for us to produce more free themes for the Drupal community.
You can change our copyright at page.tpl.php file in <theme_folder>/sttheme/<theme_name>/templates/ folder (such as /sites/all/themes/sttheme/alphorn/template/page.tpl.php).