Ah, I can logout and go straight to the page, too. I think that's a feature, not a bug. 😅 If you login there, you can enter the name you want and then select which of the available domains you'd like to use.
Discussion
I think I get what's going on. Just a really bumpy ride there that could be fixed with some HTML and CSS I think. Plus, drop all the NIP stuff. We shouldn't use those terms outside of Dev circles in my opinion. Those are meant for labeling proposals, not for use in UI for normal people. All my opinion, of course. I have no idea who even needs to see this or if this stuff is even intended for normal users. It isn't really clear. I appreciate your help!