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Before you can move or delete a control point in the graph view, you must select it first. You can select one, several, or all control points at a time. If several curves are displayed in the graph view at the same time, you can select several points on different curves to move or delete them.
To select a control point in the graph view:
In the graph view, click a control point to select it.
The selected control point turns black.
To select several control points in the graph view:
In the graph view, do one of the following:
Drag a marquee selection over the points you want to select.
Ctrl+click the points you want to select.
The selected points turn black.
To select all control points in the graph view:
Click in the graph view to make it active.
Press Ctrl+A.
All points in the graph view become selected and turn black.