Patrick,
The tour points are made up from icons held in the markers folder, by default you are limited to Red, purple, green and blue. If you want extra icons you will have to create them yourself and add them into the code (this will of course also mean you have to host the application on your own server).
There are some extra icons (colours and numbers) available for download here:
https://raw.github.com/Esri/map-tour-storytelling-template-js/master/misc/Numbered_marker_symbol_set...
http://links.esri.com/storymaps/numbered_marker_symbols
i have not had chance to look into the code but I would guess you need to add another folder with the icon colour you want, say, orange, then number each icon the same way as they are numbered in the other folders. In the main config use the colour orange and I presume the url to the icon is then dynamically built.
Have a look at the js file here to try and work out how it is done:
map-tour-storytelling-template-js/maptour-config.js at 2b35676c40e3358ac32d28e737f2dceadfd8626b · Es...
Regards
Anthony
