For more information about texture positioning the place3dTexture node 3D texture positioning.
To use the 3D placement manipulator
The texture’s place3dTexture node (swatch) appears in Hypershade and a manipulator appears in the view panel.
To use the Fit to group bbox option
The texture’s place3dTexture node (swatch) appears in Hypershade and a manipulator appears in the view panel.