About to make my first giveaway. I have a quick question.

creo que cuando se anuncia el ganador la clave se la mandas por correo electronico y te avisara donde enviarla

It'll give you an email address to send it, alternatively you could try to add them on steam and send it to them directly.

It will says one of ur giveaways has finished, you'll click on the message "click here" and it will show you the winner's email in the description write to update their emails then send the cd key via e-mail and wait for them to receive it and as k him to mark it as Received after the giveaway is over and once u send it, mark it as sent.

There is a reason that most sites have FAQ