It looks like this:

IF you do happen to click it, ignore the emails to reset it that the thing sends you and do it all manually.  Google “tumblr sign out”, then click & sign out that way.  Then go to https://tumblr.com/forgot_password and reenter your old password.  (Make sure the S is at the end of http.  Important.)  Then log back in and it should work.  NOTE: I also did this on a different browser.  I was using Firefox when the page popped up and it wouldn’t work when I reset my password — but when I did it all manually in Chrome, it worked.  Sorry guys.  Pain in the ass, I know.