Tom, when you created your new project, you should have received some instruction. For uploading sources it's best to use subversion. You can find some quick info on subversion here:
http://blogs.tech-recipes.com/johnny...ick-reference/
All the projects hosted at the Hub have their subversion repositories located here (as a subdirectory):
https://dev.mobileread.com/svn/
If you want to upload binaries via FTP, you can login with your credentials at:
ftp://dev.mobileread.com
Binaries you upload via FTP will be immediately available for everyone to download at in a subdirectory here:
https://dev.mobileread.com/dist/