Help with animation editor

Hello

I imported an animation into the Roblox Animation Editor from an fbx file, and I was wondering if I could rotate my model in the animation. I want the model to stay rotated, the whole time. But, I selected all of the Keyframes and rotated the model, the rotation only stayed for one frame. I need to know how to make it the whole time rotated.

I’m not sure if this is the right place to put this question, but thanks