premiere8 keyframe editing?

   I was trying this i punched in some key frames in the timeline and selected an effect.Then i selected the clip went To the task panel and did the moves to end up in the edit effects mode.At each key frame i would make drastic changes,such as going from red to blue or 0 to 1oo%.The manual says the program picks up on this and changes along the way but i just get one over all blend in the entire clip.Should i be clicking enter or apply along the way or maybe done then apply,the manual really does not say.Thanks  Alfrid