Why cant I comment on articles placed by Riot?

http://euw.leagueoflegends.com/en/news/store/sales/your-shop-open Whenever im on the home page of League and read articles like the the above, it wont let me comment on them. It will say: so sad, you are not autherized. I confirmed my email and wouldnt know what else to do so I can comment. Would appreciate the help.
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