Trying to follow tutorial

I am trying to follow the tutorial at

At around the 1:30 mark he switches from the animation tab to the mesh tab. In the video his character is still animating. When I try to do it the character goes back to standing still and I can’t make the change that he says to do.

I am using Unreal Editor 4.16.3-3561208+++UE4+Release-4.16

Any ideas? Here is what my screen looks like. You can compare it to the one in the video.

Great, thanks a lot.