The first step is to enable the authentication to your ui:
1) edit the file [EMS_UI]/settings/account-settings.php
Change: @define(‘ENABLE_LOGIN’, FALSE);
To: @define(‘ENABLE_LOGIN’, TRUE);
2) Reload the UI, this will now ask you for a username and password. The default is: admin, password
3) Now on the UI will be an "Account Settings" button. use that to set a new user/password