Changing the node ID is not recommended because this will lead to communication problems within the cluster. Are you really sure that you want to change the node ID?
Otherwise, you can modify the name of the cluster nodes by using the Cluster Manager.
Start the Visual Administrator tool and connect it to the J2EE Engine, choose Server/Dispatcher -> Kernel -> Cluster Manager -> Properties tab. Choose the corresponding element.name property and modify its value.
You will see in this tab that you can also modify the node ID values but as I said this is not recommended at all.