Once object(s) are selected, Left+Drag is used to move them around the layout using the mouse.

Alternatively, Shift+Ctrl+Arrow can be used to micro-move the selected object(s). The amount micro-moved is dependent on the zoom in use. To move by smaller increments, zoom in further. My moving to macro-zoom modes extremely fine adjustments can be made.

Remember that unattached objects can also be moved to exact positions using the Properties Command or by the Using Values of X and Y Translation.