Publisher ID. If you're submitting the app to Windows Store, the publisher ID you specify must be identical to the ID you specify in the Windows Store Dev Center. Look under Profile > Account.
Main Package Identity Name. If you're submitting the app to Windows Store, the Main Package Identity Name you specify must be identical to the one that Microsoft auto-generated. For details on obtaining the identity name, see Obtaining the Main Package Identity Name.
Override the App Version Number. This option is necessary if you are updating an app and you used a different tool to create your existing app. Select this option and specify a more recent marketing version number. The version number for your current app is displayed in the My Apps page in the Windows Store Dev Center.
Application Account. Select the Application account (also referred to as a "Title ID") used to publish the folios that will appear in the app library.
Language Support. This option affects the localized information in the store, not the availability of the app. For each language you list, Microsoft requires you to add a separate description and screen shots. Most publishers specify only one or two languages.