# How to change the rotation of an already existing animation?

I need to change the rotation of an already existing animation, it currently only goes forward but I also want it to go up and down.

I know I can use R to rotate but that is only for 1 frame and I need it to be done for a bunch of frames.

I looked up a tutorial on how to do it, but he only needed 1 frame, so that doesn't work for me.

Is there a way to change the rotation of a bunch of frames in bulk? Or do I have to change them all manually?