How to login with a different sso account?

view story

http://ubuntuforums.org – I can not figure out how. I log out. click login with sso It logs me in with my wife's account. No option to change to my account? We have two PC and I am troubleshooting one of them. So when getting forum help, I have to put terminal responses to draft emails, then go to my other computer, open email and then I can post a response using my sso account from this other PC. (Hardware)