First of all, thanks for helping support development, especially at that early stage
To your question, I can't add you to the list until you register the name you want to appear on the list! (Not everyone wants to use their real name--many use pseudonyms, and I'm certainly not going to be revealing personal names without permission.) The email you received contains a link to the simple form where you can register (just takes a few seconds).
Notice that at the end of the release notes for every single release since 2015 I've been reminding people to register if they haven't already. (That's the text that appears as:
As usual, if you haven't already, Prime Tier supporters and above remember to use the form linked in your original download email to provide the name you want to use in game. Attribution/names are added with each major release.) As soon as you register it will immediately appear in the following release.
If you need any more help feel free to ask!