need to edit .powered credits

Hello ,
You have the option to edit the footer content only on the pro theme
please see https://catchthemes.com/theme-instructions/catch-evolution-pro/
for other awesome features

If you want to delete it I recommend you to use first create a child theme and then delete it, which you said that you know .
To know about the child theme please check https://catchthemes.com/blog/create-child-theme-wordpress/

For swift response please visit the themes official forum
https://catchthemes.com/support-forum/forum/catch-evolution-free-theme/

regards,
bplv