Dude is missing the complicated parts:
Check whom to to report the changes.
Check how to write your commit message, with or without Changelog.
Subscribe to some mailing list (because free software is stone age)
Post your patches. You are told to sign your copyright papers.
Ask the clerk to send you the copyright papers.
Fill out the assignment request, what you did.
Wait for the assignment PDF.
Print the PDF after you've received it, sign it, scan it, send it back. In most countries via snail mail.
Wait a week or two.
Check the change requests and reviews from the mailing list. People are picky, esp. free software people.
Rebase rebase rebase.
If you are lucky you are in after some time, and your code doesn't belong too you anymore.