If you wish to add a link in the footer copyright text, this has to be done by adding custom HTML in the PHP file for the footer.

Install the WpResidence Child Theme – https://help.wpresidence.net/article/how-to-install-child-theme/

Edit templates\footer_template.php file locally

The code would look like this and it would be added in templates\footer_template.php

Upload the modified file in wpresidence-child/templates\footer_template.php after you create the folder templates as in the main theme