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First you have to join the jam, using the big red "Join jam" button. Then when you're ready, go to your dashboard and click "Create new project". Fill in the details. Once you're satisfied (game is uploaded and so on), set visibility to public at the very bottom and save. Back on the jam page, if I remember correctly, there should now be a "Sumbit game" button. From there you can pick the game you just published, and you're all set.

Hello again. I submit a game, its page is https://ivanov-andrey.itch.io/labyrinth , but when I try to submit in on jam page it says "You haven't uploaded a game that can be submitted yet." What wrong I do?  And I hope, my game interface is much simplier, than this one )....

Oh, sorry, I find out Publish button and now everything is submited, as I think :)