How to add Key frames to the compositing nodes? I have been following the 'Old TV intro' tutorial by the youtuber Blender Education and at watermark 28:40 he adds a keyframe to the offset on the x axis in a texture node. I am using 2.81 and I cannot seem to understand how he did it, although in the tutorial he used an older version of blender. Any help or answers would be greatly appreciated. 

EDIT: As you can see in the screenshot above he enters some shortcut that creates a keyframe on the offset section of the texture node. What I'm trying to find out is how that is achieved in blender 2.81. Sorry for any previous confusion.
The way to do keyframes has not changed. Hover the cursor over the item you want to keyframe and press the I key (I as in "Insert keyframe")

Or right click on the item and select add keyframe from the menu.