1. export your application as Applet, and make sure index.html in generated applet folder works fine in your computer.

Processing Export Button on the toolbar  

2. compress (.zip) the "applet" folder under your sketch folder.

Compress the applet folder  

Extra Note:

CC-GNU GPL
All the works uploaded are licensed under CC-GNU GPL.
That means:

For any questions, suggestions and feedback on the licensing issue, mail info [at] openprocessing.org

Eclipse Users: Uploading process is made easy for Processing users, but not for Eclipse users yet. So, Sinan is working on it...

OpenProcessinghome \ browse \ blog \ processing website not logged in - login/register my stuff
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Note: OPENGL uploads are currently disabled. Please try P3D instead.