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: 
You'll find your detailed explanation in the [iOS Developer Program User Guide](http://adcdownload.apple.com/ios/ios_developer_program_user_guide/ios_developer_program_user_guide__standard_program_v2.7__final_9110.pdf).
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.