The button is located in the same location on each view. To start simply click the “New Issue” button. A new window will pop-up:
Enter the details of your issue into this window. By default you only need to look at the “General” tab. The issue you create will automatically be created within your current project and under your default milestone. Should you wish to modify them then click the “Advanced” tab:
Once your issue is complete, click the “OK” button. The issue will be available to work with straight away. If within the settings you have "Open new bug after adding" turned on, the new issue will automatically open.