When someone requests feedback from you (or a manager requests feedback about their direct report) you will get a task asking you to give feedback.  By clicking on "Give feedback" it will bring you into the window where you will be able to leave your feedback for a colleague.  Feedback tasks are dismissible, meaning they can be dismissed without completing the action associated with them.  

Once you select "Give feedback" it will open a pop-up where you can leave your feedback for the employee.

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