How to: Amend ‘Powered by…’ in footer using Free version

*I believe* you need to buy ShopIsle pro licence in order to do this without editing the theme files. If you want to override the function then follow the steps below:

Create a backup of footer.php found under /wp-content/themes/shop-isle/inc/structure/footer.php
Open footer.php with your favorite editor.
Change the code accordingly.
If your site fails to load after applying the mentioned code changes then restore the footer.php file from your backup.
I am not liable for you breaking your site. Take a backup!