The website seems to have a broken register page and I don’t have an account there yet I think I’d try it after some time. Thank you for your suggestion!
Which category should the report go to? the website seems to be opendesktop.org and when I choose the websites category, it doesn’t seem to have anything related to that website.
Hm… You’re right. It is not a KDE website. You may want to send an email to contact@opendesktop.org instead and explain you can’t register and also explain what you want to do.