Footer Editing in OpenCart:
Footer editing can be a must if your theme does not allow for it, When it comes to customizing or changing an Opencart theme that can’t be changed in your admin section, can be done through actually editing the appropriate installation files files. saying this be very careful to backup before editing and do your research preferably from more than just one source.
This is of-course if you don’t have the option to edit copyright and powered by slogan in your theme
If you want to Edit the names and spelling of information links or copyright:
/catalog/language/english/common
then edit footer.php
Second, third and fourth columns are usually defined in the /catalog/view/theme/themeXXX/template/common/footer.tpl file as well as the Designed by notification
OpenCart 2.x. How to edit footer links and copyright notification
