Can't add keyframes to rigged model

Hey there,

I downloaded a dragon model somewhere, I wanted to use for an ingame monster, so I’ve rigged it. But now i’m not able to insert any keyframes in the action editor.

Does anyone know what the problem is? And how can I solve this?



Ps. I’ve used this dragon,


the action editor is for combining, stacking, transitioning etc of movement. not for keyframing. use 3d view + graph editor/ dope sheet/ timeline.