You can access User Management from the toolbar link:
This will bring up the User Management screen, which consist of four main tabs:
Self Service Users - Note that the Self Service Users page will only appear if you have a Self Service instance configured.
Permissions
Here you can:
View lists of Service Agents, Robots and Self Service Users
Create, edit and delete Service Agents, Self Service Users and Robots.
Create, edit and delete User Groups to control permissions
Reset user passwords and remove users and Robots.