Login to Rundeck server
Go to -> /etc/rundeck
Open realm.properties file with vi editor
and add user/password and roles, the syntax is
<username>: <password>[,<rolename> ...]
The Roles include: user, admin, architect, deploy, build
Add rundeck user
restart the Rundeck server
/etc/init.d/rundeckd restart
Once rebooted, login to Rundeck using http://localhost:4440 with username rundeck