If you want to check on your progress while editing your work, or just have a play through so you can see how your users would use it - there's an awesome feature called "Preview".
Previewing a showcase allows you to view and interact with your work, just as you would when using the app from your mobile device.
Any unpublished changes will also be visible when previewing, which allows you to test functionality before publishing your changes to all users. (You can view the last published version of a showcase, without unpublished changes, under the ‘Showcases’ tab).
To preview a showcase:
In the Home tab, click ‘Preview’ under the showcase you wish to preview.
Alternatively, when editing a specific showcase, ‘Preview’ is in the list of links below the showcase title.