In the Task Scheduler->Scheduled Reports, there is only a blank field. Why not a list of printers?

Good question. Keep in mind that although you are operating from your client, in the Task Scheduler, you are setting a task to run relative to the AirVision server. The server can't see printers installed on your client (and vice-versa, the client can't see what system printers are installed relative to the server). So, the only choice is to provide a field to type in an absolute network printer path, e.g.:

\\myserver\laserprinter

Or to leave it default to use the server's default system printer.