How do you turn on constant interpolation for keyframes in blender? Following a tutorial with my own keyframes and the lecture was talking about how he is using constant interpolation for keyframes so blender doesn't interpolate the in-betweens like below. Where do I find the option? I am using blender alpha right now so sorry in advance if this is inconvenient. 





What I want to do is above. I did try to go to graph editor I think and pressed N then went to active keyframe and turned interp to Constant. It did not work however I probably did something wrong.
The settings in the N region only apply to the active keyframe (usually the one selected last).

To change the interpolation for all selected keyframes, press Header > Key > Interpolation Mode in the graph editor header, or press T while hovering over the graph editor.