Forums → Support Forum → games submit?

Next to search games is featured games bar. Next to it is written submit games.
From what I know it should take about one week before your game is submitted if it's approved.

3-4 business days if the Help Page is still to be believed.

but they say to give a game file how you can get a game file?

It's the flash file from game. It has to be fůash game I hope you know that.

If you want to know more about making Flash Games and how to submit them, an easy way to gather information about that is to visit the "Programming Help Forum" here on AG!