Drag with mouse in layer's timeline to select frames.
Right-click (right mouse button click) on selected frames to popup context menu.
Mouse Drag in timeline of layers to select frames.
Ctrl + Mouse Drag in timeline of layers to select frames of all layers.
Mouse Drag on selected frames to move frames (with motion points in selected frames and next motion points).
Ctrl + Mouse Drag on selected frames to move frames (with motion points in selected frames).
Press F5 to increase frames (range of selected frames).
Press Shift + F5 to decrease frames (range of selected frames).
Press Del to delete selected frames.
Press Del to delete motion points in selected frames.
Press Ctrl + Del to clear motion property values of motion points in selected frames.