After you have installed and activated Download via Facebook;

  1. Click on "Facebook Settings" in the DOIFD Menu.
  2. Click on the license tab.
  3. Copy the license key from your receipt and paste it into the license text box.
  4. Click "Save".
  5. You will now see a button that says "Activate".
  6. Click "Activate".

Thats it! Your Done!