Whilst my 16my car has the older system, I would presume the Navigation side is still similar.
When in points of interest there is a menu button in the top left (three horizontal lines). Touching this takes you into a screen which give you various search options including another city.
Its also possible with reasonable success to search using the voice activation.
Ghibli V6 D - Emozione blu, Sabba Nero trim with Sabbia stitching and full extended perforated leather, Sport pack with 20" inch wheels, Skyhook suspension, B&W sound system and DAB radio, Sunroof, Blind spot assist, Convenience pack, Heated ventilated front seats with heated rear seats and electric rear blind, heated wood leather wheel, Incar wifi, Ebano wood