I uninstalled the S5_Box I had (from Pantheon), and installed one downloaded from the site (after searching here and finding another post about the same thing). It did not change anything. I figured out how to change the login box, but not the register box. (If you still have the login info I sent for the nediv.com site, I set up the same user on the nedivtest.com site)
I am feeling rather stupid over these two things. I don't understand why it doesn't seem to change for me (like the image-slide problem) , but it does for you. Sorry to bother you.
Site is: https://www.nedivtest.com