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When I play Commander format, every time I put a legendary creature into my deck the Forge program said I don't have any legendary creature so I can't play the game. Did I do something wrong here?

Your post is in the wrong sub-forum, this sub-forum is for "Duels of the Planeswalkers" not "Forge". So you'll be more likely to get a better response in the Forge sub-forum.

I'll move the topic, thanks RiiakShiNal.

Your commander must be a legendary creature. Were you able to properly designate which of the cards in your deck is the commander? In the Deck Editor in the upper part of the middle section of the screen there is a pulldown menu that says "Main." The hidden menu options in this list below "Main" are "Sideboard" and "Commander." You put your commander into the "Commander" decklist rather than the "Main" list.

Hopefully this is what you are asking about and this will help.