How Do I Sign Up A Separate Account Than My Wife, When It Won't Let Me Do That?

I went to Pinterest.com, clicked on "sign up using email password". On the next page, it has 2 buttons: "login using facebook" and "login using email password". It will not let me click onto the email password button. I clicked on the button once, and then a few times in rapid succession, but nothing happens, and it goes right into my wife's Pinterest "welcome home" screen. How can I get into the "sign up using email password" section? My wife just hits the app button on our iPad and it goes into Pinterest automatically without a login or password screen.