Hello,
If you want to change just your company name in the copyright text, you can do it in template parameters: Extensions > Templates > Chess > Features > Branding (Joomla 3) or System > Site Template Styles > Chess > Features > Branding (Joomla 4 and 5).
If you want to change the copyright text more, you should edit the file "/templates/sparky_framework/library/c.php" (open it in any plain text editor and change the copyright paragraph).
Regards,
Milos
