You can modify host information after the host has been added to the provisioning system. Hosts are locked when a user saves a modification to prevent different users from simultaneously updating the same host.
You might want to edit a host in the following situations.
You need to update the host-type attributes of a particular host.
You want to add the host to or remove the host from a new or existing host set.
See How to Add a Host to or Remove a Host From a Host Set.
This task can also be performed from a host set's Details page. For more information, see How to Edit or Hide Host Sets.
You want to modify the host description.