I have an old ehentai account, i used to able to access sadpanda whenever i was logged into ehentai, but at somepoint last year, i couldnt. It just leads to a white screen no login or anything, never could figure out what happened
it's very simple - you just need to log onto ehentai's forums using whatever account you create, and THEN go to exhentai
however, if you did this in the wrong order it won't work, and you'll need to clear your browsing history first and try again. sometimes it takes a few minutes for access to sadpanda after logging onto ehentai though