Unable to change animation interpolation or extrapolation I'm new to Blender and I have a simple animation consisting of an empty object changing orientation around its Y axis about 30°. The steps to animate this:


Opened up timeline and set position to 0 (pos of keyframe 1)
Hovered over object's Transform > Location values box and hit I key (so that it highlights yellow), thus placing keyframe and pos 0
Moved to pos 60 on timeline (position of keyframe 2)
Changed orientation of object as desired
Hovered again over Transform > Location and hit I, placing keyframe 2. 


When I hit play the object rotates with a bezier ease in and out. I want a linear interpolation, so I go to the dope sheet, highlight all keyframes, and hit T then select linear interpolation, but the animation remains with an ease in and out. I also go to Channel > Extrapolation Mode and choose Linear with no visible change.

My graph editor is completely flat and shows only 2 points (presumably the keyframes). 

Screenshots for clarity: 1, 2, 3







Any ideas what I'm missing? Thanks in advance.
You are not supposed to be changing Extrapolation mode, that is used for "extending" or repeating an animation after the last keyframe, as far as I know.

You are supposed to change the handle types, instead.

Select all your keyframes with A and then press V Set Keyframe Handle Type > Vector