No, you did not.
Do you know how to do it?
You see the small gift box icon on the top, and you should click on it, and you shouls send the code at your page.
It is not enough that you entered the code when you created the giveaway, after its finish you have to release the key to the winner.
Please check!

Here is the present status of the winner page:
https://ibb.co/nyt4cS