Question: I would like to allow the user of my XULRunner based app to be able to do copy/paste via a context menu. 
Keyboard shortcuts Ctrl-C and Ctrl-V are already working fine

Answer: 
Three best links I could find are :

<http://www.mahalo.com/answers/what-is-the-process-to-submit-an-application-to-itunes>

<http://help.appmakr.com/entries/218997-how-to-upload-your-app-to-itunes-connect-using-application-loader>

<http://www.weston-fl.com/blog/?p=2442>
Apple has excellent documentation:

<http://developer.apple.com/library/ios/#documentation/Xcode/Conceptual/iphone_development/145-Distributing_Applications/distributing_applications.html>

In summary:

1. Make sure your application is something of value.
2. Great a distribution provisioning profile in the developer portal.
3. Archive you application using this profile.
4. Log into iTunes Connect and add an application - there will be several pages of fields to fill out. Upload your application.
5. Wait for approval.