Can I remove the "Powered by" link
From JReviews Documentation
Yes, you can remove it. However, it would be great if you can promote JReviews to everyone you know or provide credit in some other way to help us with the traffic to our site so we can continue providing excellent support and upgrades.
To remove the "Powered by" link, go to the JReviews Configuration, General Tab and set this setting to Yes: