Caco

I bought for not much money on Pixel Game Card but i'm not sure how and where i'm supposed to apply the code if anyone can help me finding any ways to register my generated code on the pixel game card website directly to my vendetta gaming network account, the shop might not be the greatest but i surely wanted to look forward to. most of the indication where quite confusing, passing by the mystery box to ass selected content to find them in game, but i have a code on PGC that worth the amount and can't seem to be able to use it in any ways. thanks for the help if someone have the courage to guide me a bit trough this maze.