How do I put the copyright / name site in footer
First, make sure your site name is stil configured correctly. You can do this by going to yoursite.com/admin/config/system/site-information.

If the site name is there and still does not show up, then the theme you've selected is likely not working correctly. Head over to yoursite.com/admin/appearance and click on 'Settings' next to the theme you're using. Browse around and see whether there are any options to set the copyright message.

Failing that, modify the message directly in the template files. You will have likely installed your theme to /sites/all/themes/theme_name or /sites/default/themes/theme_name. Browse to this folder and look for a file called page.tpl.php (it may be in a subdirectory). This file will likely contain the copyright message which you can change right then and there. Alternatively, the copyright message maybe in the html.tpl.php file, which should be in the same location as page.tpl.php.