A lot of WPZOOM themes have copyright notices as standard, and you can easily edit the text from Appearance > Customize > Footer:
If such an option is not available in your WPZOOM theme, we’ll show you how to edit the existing copyright notice in your site’s footer:
If you want to translate or change the words from the existing copyright notice, we recommend following the instructions from this tutorial.
Before making any changes in your theme files, please create a child theme and duplicate the file you want to modify (footer.php) in the child theme.
Go to Appearance → Editor and select the footer.php file from the list on the right in your child theme.
Using your browser’s Find option (Ctrl/Cmd + F), search for the line containing the “Copyright” text.
Once you’ve found the needed line, feel free to modify it as needed, but be careful if you’re unfamiliar with HTML/PHP, as you can easily break your website.