"Logged in as" message not appearing in Rails for beginners part 15

Hello,
In the "Rails for Beginners" part 15 video, I can't manage to get the "Logged in as" message to print out on the page.. I tried everything I knew, and it seems that a few other people are having the same issue on the comments. Any suggestions ?

Video link : https://www.youtube.com/watch?v=IzbQAj_tcfI