> SirLovecraft
if you go to the official home page , not the forum, and log in in the upper part of the page. (black line; icons;facebook,google+,twitter,youtube ----*nothing*----- log in/username)
then press your username and simply choose the options steam keys from the drop down menu.
to get the keys you have to claim them from the giveaways - that seem to occur every now and then . (resetting every full hour - so get there in time if you don't have the wanted key yet.)
you claim those keys from that very page, when there are keys available a blue button will be next to the games name, and by pressing it, following the one instruction you get you can then receive a key.

I hope this will be of some help. // Yersinia