Depending on how your organisation is using JIRA, you might need to add a new step in the issue 'workflow'. A step in the workflow is called a status. For example, if you are using JIRA to track purchase orders, you might add a new Status called 'Purchase Approved.'
You can also create new workflows to accommodate the way a specific process works. To do this, you first create a workflow (often this is easiest to do by copying an existing workflow similar to the one you need). After setting up the workflow, you then activate it so that any issue types affected by the workflow can be updated to use the new workflow.