The Blend Shape Editor appears, displaying a section for each blend shape deformer in your scene.
Click on the name of the blend shape deformer you want to control (default name: blendShapen).
The editor expands to show controls for the selected blend shape deformer.
TipTo change the orientation of sliders in the Blend Shape editor, select Options > Orientation > Horizontal. (Sliders are arranged vertically by default.)