Board Game Arena

I own the physical boardgame 7 Wonder Duel. It came with a code to get premium on boardgamearena but I am unable to find the right area to put it in - would you mind directing me to the right place?

It is of the structure: XXX-1XX-1-XXXX-1X11-1XXX

I think it should be there: https://gift.unboxnow.com/

According to this topic in French that seem similar but for another game:
https://boardgamearena.com/forum/viewtopic.php?t=28484