How do I stop users from running a workflow?

How do I stop users from running a workflow?How do I stop users from running a workflow?

To disable a workflow so that users are not able to start new instances but existing instance finish running, follow the instructions for Disabling a Workflow. To remove a workflow from the list or library, including terminating any existing instances, follow the instructions for Removing a Workflow Association on the same page. For more information, you can also see the Remove a workflow from a list or library and Remove a Workflow Solution From a Site Collection or Web Application.