This feature is available in Catalyst, Enterprise, and Ultimate editions.
Select Team > Review > Retrospectives.
To add a NEW Retrospective, click on the blue "Add Retrospective" button at the upper right of the grid.
To edit an existing retrospective, select the retrospective you want to edit and open its Conduct drop-down list. Select Edit to open the Edit window.
Change the details as required, then click Save. To close out the retrospective, select Close from the Conduct drop-down list.