To delegate responsibilities to delegated administrators, the administrator runs a workflow. If your setup does not already contain a user group that has the permission to register and update vCenter Server extensions, and the permission to run workflows in vRealize Orchestrator, you must first create such a group.
Depending on your current setup, you might have already performed one or both of the first tasks.
What to do next
Restrict permissions to various workflow folders in vRealize Orchestrator.
