Work portal login

Hello, I'm trying to access the login interface in the work portal and I can't. The logged in user is admon and everytime I click on logout the browser just refreshes the page and admon logs back in. I created a few users and assinged them their passwords, and I can't log in with any of the created users because admon won't logout. By the way, I have assigned performers to every activity in the process, how can I decide which activity can be done by the user that is logged in, and how can I create an user that doesn't need a password to use the process, for example someone like a customer.