Create new users in prototype/demo mode

Hi guys, I followed the steps of the guide to setup the security to prototype/demo mode. At the end of the steps it says to deploy your application and create new users with different roles. If I deploy the app I get straight to the default ‘sign in’ page of mendix. I am unable to create new users though. How can I do this?    
1 answers

You can log in with the account ‘demo_administrator’. The password can be found in your modeler. Go to Project → Security. Tab 'Demo users’, double-click on demo_administrator and in the popup at the right side click on 'Copy password to the clipboard’.

Once logged in, you can go to the page for creating useraccounts.