When I click on Login, it leads me to a page that says "we may have moved this page." I'm using Chrome.
It is working fine on my pc. I think you should try opening it once again after some time. It might work then.
Wait for sometime and open it again and it might just work. Contact chrome if the issue persists. Are you sure you have the right link for it? Check here - https://www.treasurydirect.gov/RS/UN-Display.do