Won't Let Me Create New Account, Goes Into My Wife's Account.

Last answer I got from helpowl.com said go to Pinterest.com, click "sign up w/email", to bypass Facebook login, of which I'm not a member. OK. Clicked it, and got to the login screen w/the Facebook & email login buttons. Tried that, couldn't select the "email login w/password" button. Clicked it a few times, it automatically went into my wife's "welcome" screen. OK. Tried to go into www.pinterest.com again to try again, but now it automatically goes into her "welcome" screen. (She only has to select the app button on our iPad to run it, no password or anything else.)