In WordPress, the footer credit line is a text with a link to credit the WordPress and its theme developer. You can anytime change the footer credits of your theme if you have something more important to display there. In general, this is done by editing the footer.php file of the theme active on your website but now you can do this thing visually by using a plugin.
Simply install and activate Visual Footer Credit Remover plugin in your WordPress site and then navigate to your admin area dashboard’s Tools → Visual Footer Credit Remover and click OPEN VISUAL EDITOR button.
This will take you to the home page of your website with a visual composer box on the right. Simply scroll down on your website, click the footer text you want to edit, and replace it with your own text in visual credit remover box. Click the save button and you are done.