The main window of Publish shows you an overview of the setting to be used (the top dropdown), here you can create and save a publish setting with can easily be reused later.

The Print Views window shows what is to be printed - with a detailed view of which printer, how many views and which setting is to be used.

The Export Views window shows what is to be exported to DWG and using which setting.

Finally, the Publish button will publish - print and export with one single click.

The Print configuration allows you to setup exactly how the printing process of publish is to function.

Printer Name selects a printer, either paper or file-based (for instance PDF or DWF). The print to file checkbox is used for printers which usually prints to paper, not for PDF-printers.

The Sheet set is where you select which sheet set to print - using an improved version of the standard Revit sheet set window. This set can also be reused by normal Revit functions.

Settings is the normal Revit saved print setting - controlling things like scale, paper size, etc.

The lower part with parameter selections is for configuring the filename - these windows are disabled until the "Use Naming" checkbox is checked. Here you can select the naming scheme to be used, both for views and for sheets.

The Export configuration is where you select the export options you would like to use. This works in a very much similar way as the print configuration.

Please note that the Export Setting uses the regular DWG export settings, these need to be pre-created in the Revit export to DWG options in order to be available here.