For suggestions or questions about any of the apps, please use the Support email address.
You can find detailed documentation of all features here: DesktopShelves User Guide
For questions or problem reports, please use the built-in feedback mechanism of DesktopShelves.
You can access it from the DesktopShelves menu icon under Make a Suggestion...
Alternatively, you can always just send an email to the Support email address.