ah ok - now i get it, what this link i found was for.
ok, so as a Summary (for others with the problem):
- as a KS-Backer you dont have to register the ring with the NFC Control app
- you've got a mail, with a verification-code
- this code u can reset on this site, using your mail-adress you used at KS
- with your mail and your verification code, you can use the NFC Unlock app
thanks a lot for clarification Lufunamor