If you come by train, taxis are obviously available, but you may also use the funicular railway which will lead you to Les Arcs 1600, and, from there, you will have to take a shuttle bus towards Les Arcs 1800, by hopping off at the La Croisette building bus stop. Then, walk next to the La Croisette building, and maybe next to Les Chardons et/ou Le Prainan.
If you are lost, you may contact me at +33 16 29 62 65 or bell the concierge, of whom you have the contact details.