We use the text convention ... / to indicate your path to the demonstration sites, which may well be different from ours. For instance, on our Apache machine, we kept all the demonstration sites in the directory /usr/www. So, for example, our path would be /usr/www/site.simple. You might want to keep the sites somewhere other than /usr/www, so we refer to the path as ... /site.simple.
Don’t type .../ into your computer. The attempt will upset it!