To create the Story Map Tour I went to http://storymaps.arcgis.com/en/ and signed in then scrolled down and clicked “Create a Story” choosing the map tour option. I then chose the import option that best suited my image storage needs.
If using Flickr, you will make sure the images you want to use are in an Album and are Public then you will search by the Flickr name and import that album.
I located the images on the import map by hand since many of mine weren’t geotagged; it doesn’t have to be exact as you can move the pins later.
After importing the images, I was able to customize the tour by organizing my images, changing the background and pin colors, adding my own icon and hyperlinks, and entering descriptions for my images.