title: How to make Mac app archive signed?
body: <p>I want to publish my Mac app to Mac App Store.</p>
  
  <p>So I've tried to sign my app and archive with Xcode 4.</p>
  
  <p>I got the process to sign the app - build settings.</p>
  
  <p>However, I don't know how to sign archive(package).</p>
  
  <p>In Organizer, when I tried to submit with archive, identity drop box shows that "No valid signing identities found" and others aren't showed.</p>