Only process admins can add stages in the pipeline.
You can easily add new stages to the Pipeline by following these steps:
1- On the Pipeline, locate the edit button (“wheel” icon) next to the date, at the center of the pipeline toolbar.
2- Click on the button to go to the pipeline editor page. The page has two columns: the Project Stages list on the left and the Stage Editor on the right.
3- On top of the Project Stages, click on the “+” button to add a new stage.
4- Use the Stage Editor to give it a name and governance/guidance.