How to remove the demo watermark of flipbook?

I have the demo version of your flipbook creator program. So, I have bought some points today via internet but I thought when the payment would have been done your Demo Flipbuilder website and logo would have disappeared. I have inserted the embed code on my website, is it possible to know what is the way to take it off please?

Only when you register the program with license key will the demo watermark be removed from the output flipbook. You can purchase license code to register the program here: http://www.flipbuilder.com/purchase.html

However, the Points are used for Cloud Service (FlipBuilder Online Service). The Service allows users to upload flipbooks to our server by charging monthly or annual fees; yet this paid service can't remove the demo watermark of the uploaded book. For more info, you can refer to FlipBuilder Online Service.

Note: The license code is valid for life-time and you can create unlimited number of books as you want and upload them to your server totally free.