Thank you very much for your purchase!
When you launch the program, a nag screen appears and you have to wait 30 seconds before you can close. This nag screen doesn't appear on the very first use, maybe that's why you haven't seen it.
At the bottom of the nag screen, there's a button to enter your license information. Once entered, the nag screen should disappear and never appear again.
Please tell me if you need more help