it sounds like you are working with the Coordinate Manager (down at the bottom on the right beside the Attribute manager) that’s not really for animation and keyframes. You’d want to be changing rotation in the Coords section of the object in the Attribute Manager
An object’s enterable coordinates are in the attributes manager in the coord tab. Just changing things there won’t do anything either unless you have auto keyframes turned on. Or you can make the change, then click “record active object” (bottom right area in the time line) to force the keyframe.