Ah, ok, I thought there might be a missing chunk of question.
As an admin, go to project administration -> workflows. That should list the workflows in use for this project (it is possible to have one for each different type of issue in a project). Find the workflow for this issue type, and descend into it. You will be offered an "edit" option, and that should take you to a draft copy of the workflow, in a graphical editor.
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