1) The code appears in the following format: xxxx-xxxx-xxxx-xxxx. To open it go to the character button on top of the page, then personal - preferences and scroll down to the button Enter a promotional code.
2) Click on the button Enter a promotional code and the window below will open. Copy and paste your code and click on Receive a bonus.
3) Your reward will be shown in your chat window.
You are allowed to gift the code but only via ingame mail or gift.
If we detect the code being used on another account without having received it through mail or gift, then it will be against rules.
Further, the use of this code with any multi-accounts is punishable according to game rule 1a/b.