You've purchased a Gift Card. You can use the Gift Card for yourself, or gift it to someone.
If you've decided to keep the gift card for yourself, just use the gift card at checkout with the store that you purchased it from.
To gift your Gift Card click on Profile (1) then click on the Gift Cards (2) tab.
On this page you'll see all of the Gift Cards that you have purchased. Click the Magnifying Glass (3) on the far right of the card you want to gift.
In the Send Gift Card Area (4) fill in the bold fields of the recipient (and a message if desired). Once you are completed, click Send Gift Card at the bottom of the page and the recipient will receive the gift card in their email inbox.
Note - Once you send a gift card to a recipient, that gift card will no longer appear in your gift cards tab.