When a basemap can be edited (raster images can't be) you will see an edit button as follows:
Clicking that button shows the following buttons:
These buttons allow users to:
•Save Changes
•Edit existing shapes
•Add a point
•Add a line
•Add a polygon
•Delete a selected shape (can also be done by pressing delete key on the keyboard)
•Revert changes.
If users are editing a shape and want to finish the editing to move to another shape the editing can be finished by right clicking, double clicking, or clicking any of the buttons on the edit toolbar.