If you are looking to learn how to code AS3 just ask me on my profile, and I can supply you a link to an awesome tutorial to making games in Action Script 3.0 using Flash(the only program allowed on AG). Any more questions concerning creating games should be asked in the programming help section.
As for the original question concerning this thread. I believe I would say the same thing as anyone else, but just to be sure if you really have no idea how to find out the dimensions of a game you made, because you did not tamper with them or whatever, then one way to check is to go to the original .fla file, and go to the menu at the top of the flash program, and select the drop down menu labeled "Modify" then go to "Document..." (or if you have trouble finding this for some reason try pressing Ctrl + M if you have a PC). When you do this it will open up a new window with a list of options. The first one will be labeled "dimensions" which will tell you your current dimensions, and allow you to change them for your flash game. Once you know these then you can put them in to submit to AG, but this is only if the game was made by yourself of course.
