Looking for logging into the Kubuntu Change Screen site and are not getting the correct working link for it? In such a case, you can use the links given here by searching your desired login page in the search box. If the page is present on our website then you will get all the links related to the Kubuntu Change Screen site. After that you can login as usual with your login credentials.
https://askubuntu.com/questions/871031/how-to-change-login-screen-sddm-on-kde-plasma-5
https://forum.kde.org/viewtopic.php?f=17&t=13166&start=15
https://forums.linuxmint.com/viewtopic.php?t=247914
https://ubuntuforums.org/showthread.php?t=868431
https://www.kubuntuforums.net/showthread.php/71093-How-do-I-change-the-login-and-splash-screens-in-Kubuntu-16-10
https://ask.fedoraproject.org/en/question/84668/how-to-change-kde-login-background-image/
https://www.reddit.com/r/kde/comments/6w7jfq/default_loginlock_screen_wallpaper/
https://www.maketecheasier.com/customize-kde-lock-screen/
https://forum.manjaro.org/t/solved-kde-5-9-m-17-make-ssdm-and-lock-screen-use-the-same-background/22561
https://pointieststick.com/2018/04/29/this-week-in-usability-productivity-part-16-new-lock-and-login-screens/
https://www.linux-apps.com/p/1216681/
https://wiki.ubuntuusers.de/SDDM/
https://github.com/sddm/sddm/issues/721