Select
the light glyph, or select the light in the Lights in Model window.
Select
the Position grip.
The Position grip is at the
bottom of a spotlight and at the center of a point light.
Drag
the light to the new location and click to drop it there.
NoteA spotlight rotates as
it moves to maintain its aim at the target. If you want to move
both source and target, drag the light glyph itself, not the Position
grip.