Click on a line or point in the controls box and then add your info to the map.
Ctrl-click to delete a line or point.
Click on an existing line or point to edit its details.
Click on a selected line with the pointer finger to edit its verticies.
Works extremely well on ArcGIS.com (accounts are free) and ArcGIS for mobile devices.
- Search for "Winter Biking Conditions"
Click event on lines can be missed. Must try a few times before editor box appears.