A PART has to be inserted to use the traditional style mates. Move face can be used to move a BODY.
To insert a new PART.. Insert>part> then click the last box under the "Locate Part" drop down and it will bring up that first dialog, you can then hit the translate/rotate button on the bottom to move/rotate using x,y,z coordinates.
To move a BODY in a multibody part go Insert>move>face.
Select all the faces of the body in which you would like to move. Select a direction and then specify distance. Please note the selected face on the outer ring is the selected face for direction, it is not part of the move. You may also rotate bodies using this same concept, and offset faces.