This will bring down a sheet where you can select the ipsw file you just downloaded. When it's finished, you should be at the setup screen.
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Your Apple TV 2 is successfully jailbroken on the latest i OS 6.2.1 ( i OS 7.1.2), the latest firmware currently available for the device.
You should now have the Filecore app installed on your TV.
The part that was most interesting though was what was mentioned by the hacker towards the end of his article.
A rough translation of what was mentioned stated that the vulnerability found can be triggered in the i OS sandbox, so it can attack the kernel right from the app to obtain the kernel code execution permission.
He continued by recommending that users upgrade to the latest version as soon as possible and avoid installing apps from unknown sources.
The conversation this issue starts is whether users should update to i OS 9.2.1 due to security vulnerabilities or if they should stick with i OS 9.2 in the hopes of a public jailbreak release.
This will bring down a sheet where you can select the ipsw file you just downloaded. Now select "This computer" under backup on i Tunes, then click "Back up now".
Now SHIFT Click (on windows) or OPTION Click (on mac) the "Restore i Phone" button.
Issues like these could potentially put your device at a big risk so taking precaution where possible is usually advised.