If you don’t want the WordPress default admin footer text then this snippet may help you to edit the code to add your own links, text, or anything that you desired to add to your admin footer. Paste the code in the function.php file in the child theme and add what you like.
// Change footer text to admin panel
function wps_remove_footer_admin () {
echo 'My footer text. Thank you, WordPress for giving me this filter.';
}
add_filter('admin_footer_text', 'wps_remove_footer_admin');
in the above function, we are simply printing the text to the footer and lastly adding it to add_filter to display the text.