To add a new story that can be only Defect,
1. Click on Add defect button.
2. On click, quick add drop down asking for details will open.
3. User can give appropriate name to defect and estimate the story.
4. If you want you can save the story or else you can add with more details.
5. To add the story with more details click on Add with Details.
6. On click of Create, the defect story will be created and then you can change other details in that Defect Story.
To Save the defect story,
1. Click on Save & Close.