The Shipments screen is very similar to the Orders screen. Orders do not show up in the Shipments screen until at least one item in the order has a picking number (see Create Shipment).
Most of the features of the Manage Shipments screen are described in the Manage Orders section:
Filters in Order Processing work the same as they do in the Orders screen. Please see > Order Processing > Orders tab > Filters.
The Batch Report button becomes active when you select at least one order or when you are viewing a Batch of orders that you have created. Miva Merchant comes with one shipment batch report: Shipment Picklist.