Creating new Issues on the Story Map

To create a new issue on the User Story Map, hover over any blank space under an Epic and click anywhere in the blue box with the plus sign:

Clicking in the blue box will open the following 'Quick Create' box:

Simply inline edit the story summary and hit enter to continue quickly creating stories beneath your chosen epic. 

If your project has additional Required Fields the standard "Create Issue" dialog will appear.

You are also able to create new issues between other issues: