Why can't I get into tumblr?

Ok. So I went on tumblr.com (after realizing i haven't gone on since last year) And it just had the sign up screen. No button that said 'already a member' or 'already joined?' or anything like that. I went to my website for tumblr and it was still there with all the old posts. I really wanna update and make new posts because.. well. i am on google for some reason (no not as Snickers Hull snickers is my cat) So please help me!