By all means feel free just to chat in the guestbook - as long as it's not spam!
Anybody with Admin below their name is definitely me or a trusted person. I myself will always sign as Butterfree. If somebody signs under that name but does not have the Admin label, it is most likely an impostor.
Thanks so much for giving feedback on my site! I took it as a learning lesson, and actually already started going through pages and rewriting sections and fixing the things you pointed out to me, so thanks! Maybe someday in the future I'll send you another request. :)