Publish Android Application option missing

I am using Xamarin Studio 4.2.3 (build 60) on a Windows 8 machine to write an Android Application. I am following the publishing guide available at http://docs.xamarin.com/guides/android/deployment,testing,_and_metrics/publishing_an_application/part_1-_preparing_an_application_for_release/

But, I do not have a "Publish Android Application" option in the Project menu. I am not sure how to proceed, how do I get my app signed using the private key I created?

Any help will be appreciated.