Ok, first, what is the URL of your WordPress.org blog?
Second, do you see a Jetpack section in the Dashboard of the blog? It will be in the left sidebar near the top. If so, do you see a blue Connect with WordPress.com button there? If yes, then click that.
If you don't have a Jetpack section in your blog's Dashboard, head to the Plugins section and click the Activate link under Jetpack.