Find your objective on the Objectives Overview page (you may need to go to the quarter (or cycle) where the closed objective is).
Click on the title of the objective to go to the objective's detailed page.
Click on Re-open objective in the Actions drop-down menu
Once reopened, you’ll be able to check-in and make edits to the objective.
Note: The objective will be reopened for the quarter (or cycle) it was originally assigned to.