Looking for logging into the Lol Custom 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 Lol Custom Screen site. After that you can login as usual with your login credentials.
https://boards.na.leagueoflegends.com/en/c/league-videos/Bg0f0P8x-how-can-i-use-a-custom-login-screen
http://forums.na.leagueoflegends.com/board/showthread.php?t=2970279
https://boards.euw.leagueoflegends.com/en/c/alpha-client-discussion-en/EAj41QXJ-login-screens-change
http://forums.euw.leagueoflegends.com/board/showthread.php?t=943918
https://na.leagueoflegends.com/en/news/community/community-spotlight/find-your-favorite-past-login-screens