For each graphical edit, the handle to select is shown below:
Select the handle to move the workplane's origin.
The coordinates of the origin of the active workplane are displayed (in red) in the Status bar, next to the Workplane drop-down list.
Select a handle to change the direction of the X, Y, or Z axes.
If the mouse button is released over an item, then the axis points directly to that item.
Select a handle to move the workplane along the X, Y, or Z axes.
Select any blue handle to twist the workplane around its X axis.
Select any green handle to twist the workplane around its Y axis.
Select any red handle to twist the workplane around its Z axis.
If the mouse button is released over an item, then the rotation snaps to that item. For example, if the handle at the end of the Y axis was dragged and dropped over an item, then looking down Z axis, the Y axis would be pointing directly at that object.