iptvrocket.is
at the rocket website (shown above), click on the Check Rockets tab
BUT, I just tried it and seems the site is under maintenance.
If that tab opens for you then continue.
But if it leads to a 404 page error, then go to nfps website and click on the IPTV Reset-Donation-Checker tab
iptvprivateserver.is
enter the 15 digit Order number and the 12 digit donation number, as it asks for.
Then a new page will open with your donation information. That is where you attach (link) your MAC addy and also is a Reset function there too.