When i export my game with the scirra thing, i get the files, but it does not work when i try to do it. Somewhere it says that you get one folder called game.zip, but im not getting that.
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Try following this, maybe you have missed something:
Press F6 (Export), select "Scirra Arcade" (The Gear Icon), then "Set Destination & Name" then Export. (A Side Note: Remember to minify script since it is recommended.)
Open the Project Folder you have exported at the destination you have set. There is a .zip file there and that is the one you upload to Scirra Arcade.