the answer depends on whether you are on cloud and specifically Next-gen projects.
Classic project - you need to be an admin for the project or system and go into Project settings > workflow. edit the workflow and add in the new status and transitions. See more here.
Next-gen - go to the board for the project and click on the + at the far right
Learn how to use two new reports for next-gen projects in Jira Cloud: Cumulative flow diagram and Sprint burndown chart. Ivan Teong, Product Manager, Jira Software, demos the Cumulative ...
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