How do I edit keyframes of an animation

Hi everyone,

As the title says I'm trying to edit an animation and adjust the rotation of the hand during a walking animation. Whenever I go to add a key frame with a change to the characters hand, it disappears completely. I'm noticing that if I try to edit the parent object it works fine but I'm scratc$$anonymous$$ng my head when I'm trying to rotate the hand. Please see the following images of my $$anonymous$$erarchy and animation tab.

The red outline represents what is working w$$anonymous$$le editing key frames and yellow represents what I am trying to edit and save.