Depends on what you got.
ibProArcade-Games come along as .TAR Archives. Upload those Archives to /arcade/tar/ in your Forum, after that just enter the AdminCP and you should see those Games in ADD GAME for automatic TAR-Installation.
Same works with original v3arcade-Games (not repacked ones who miss the .php-File), just put those in /arcade/zip/ and they should appear in ADD GAME Menu