Umm to upload your video game to your website?
Try this
1) Access your FTP (Log-in etc..)
2)Put your file in the folder you want it to appear in OR your public_html folder
Once you FTP it it should look like this
If you put it in a folder -
http://yourdomain.com/FOLDERSNAME/Filename
Or your public_html
http://yourdomain.com/FILENAME (Be sure to add it's extension like .swf .exe etc..)
Hope this helped