You can add or remove Access Roles that can make transitions between workflow steps.
To change the permissions:
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Go to the Administration tab > Versioning and Workflows.
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In the Workflows section click the workflow where you want to change the permissions.
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The Steps window opens. Double-click the arrow (transition) where you want to change the permissions.
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Add or remove Access roles.
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Click Save.
Your Workflow steps transitions permissions are now changed.