This action requires a typo3.org login
Make sure you have a typo3.org account. You can create one by using the "Create typo3.org account" button and return afterwards to this window and login.
If you already have one, you can login by clicking the "Login with typo3.org" Button. A popup will open and present you the typo3.org login box. Login there and you'll be logged in here too.