How to enter license

Hello, I purchased a license for Netcam Studio. But I don’t know where to enter this license. I already read some threads about licensing. And there I found the answer that there is key icon in the main in Netcam Studio X. But I cannot find that key icon in the software.
Is there any other advice how to enter the license?

Hi,
Thanks for the purchase. Follow this guide How to change license number
-Henrik