How to add extrapolation functionality in Blender 2.69? I saw this short tutorial on youtube, 
someone made a rotation animation of two keyframes, opened the graph editor, changed the interpolation mode to linear and selected linear extrapolation. The effect was, that although he animated a limited rotation, the extrapolatiton made the rotation infinite in both directions.

I tried to make this with my Blender (version 2.69), but as I opened the Key-window inside the graph editor there was no Extrapolation mode to select, only interpolation mode. 

Do I have to add this mode separetly or is there another way to create this infinite rotation ?
In 2.69 this was in the Channel menu (&#8679; ShiftE):



However I recommend updating to the latest version (2.75). See Is it advisable to update Blender to the newest version as soon as possible each time?