Welcome to the site, bhrisbrown.

You'll see a notification at the top right of the menu (gift box icon) when the giveaways have ended. Click that and there should be an option to "Send gift" under the "Sent" column for the respective giveaway. Click that and paste any keys (if the option is available), or simply e-mail the key to the winner.

Thanks for the giveaways, and happy gifting/winning!