Connect a robot to orchestrators as described here
Click the UiPath Robot icon in the system tray which is visible there.
Select Orchestrator Settings from the Settings menu.
Enter the key received from the user who created the Robot in Orchestrator in the Machine Key section (as obtained from the Machines page).
Enter the Orchestrator URL in the Orchestrator URL area. Make sure to include the AccountLogicalName and ServiceName if you're using one of your Cloud Platform Services, such as
http://platform.UiPath.com/[AccountLogicalName]/[ServiceName]/
Connect by clicking the Connect button. The Robot is now connected to Orchestrator and has the status of being available. When a Robot is added to Orchestrator, a Robot user is created and the Robot role is assigned to them. (It's available on the Users page.)