Issues changing keyframe values with keyboard while in animation comp

This is in the “edit animation” pop up viewer. I select the keyframe, enter a value in “F” and “V”, press enter, and the keyframe is not changed. Thanks for the help ahead of time!

Sarah I am new to this comp too but how about just holding alt and clicking to set your values? Or if on mac option click. This Bileam tutorial is good too: