Hi Kenneth -- We can better help you if you provide a bit more information.
1. Based on the dialogs in your image, it looks like you are using a URL to add the tiled basemap. What basemap are you trying to use? Is it a basemap created by Esri, or is it one you or your organization has made?
2. Why are you trying to store credentials with it? If you are creating a web map in ArcGIS Online for use in Collector, storing credentials isn't required for using the map offline.
Thanks!
Esri Education Team