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2. Click games in the top left corner
3. Click Activate a game by product key or something like that
Goot luck :D
EXTERNAL LINK:
http://www.get-cracked.com/wp-content/uploads/2015/09/Games_Activate_steam_client.jpg
Try asking in the Arma 2 forum, maybe someone there can help.
I should have read the question more carefully...