try adding the Url below at line 123 of the index.html
//Modify this to point to your sharing service URL if you are using the portal
sharingurl: "http://www.arcgis.com/sharing/content/items",
//specify a group in ArcGIS.com that contains the basemaps to display in the basemap gallery
I did eventually find this in the readme document but it was under Specify map options. It should be under configure the application right under #3 where it tells you to put in your webmap id. I was just trying to make sure it worked before I tried to "specify map options". Thanks for pointing this out to me.
Josh White, AICP
Principal Planner
City of Arkansas City