After you have finished building your map, click on "Compile Mission" in the main DG2Architect window
Fill out the data required and click (Submit)
To locate your compiled map go to "My Documents/DG2"
Select your maps folder, right click on it, and select
"Add to Archive" from the dropdown
For "Archive format" you must choose "ZIP" atm
Congraz - Your packed file is now ready to upload to this site