The progress of each objective is based on the progress of its key results, thus you cannot update the value of the objective’s progress yourself.
You can read more about how the progress is calculated
Updating the objective
It is a good practice to update the objective’s status and write a summary of what was going on each week. By doing so, you keep your coworkers and superiors informed, and at the same time they don't have to click through all individual OKRs.
How to update the objective?
Go to the objective’s page.
Click on the “Update” button. add screenshot
Choose the objective’s status. If you have updated the objective previously, you would also see the previous status. add screenshot
Write a summary of the progress of the objective. You can think of this description as a message for everyone interested in this objective.