I use on called Rbrowser. It works okay.
http://siteadmin.comicgenesis.com/net2ftp/index.php this is a web based one that's easy to use.
Once you get the hang of it it's pretty easy.
the basics
First u need the password and user name u signed up with. Not the forum one.
Then login in. If using an FTP app. Make sure it's set to FTP. There are other settings.
There will be a few folders. One called public and One called workspace. Don't mess with the public folder or anything else that isn't in the wOrkspace folder.
Go into the work space folder. There you'll find the HTML pages. Daily Template and index template. You can down load those and edit them if you want to change them.
There's also a comic folder. That's where you put all your comics.
make sure comics are saved as. Yearmonthday.file. So say 20110507.jpg.
That's basically what you need to get a comic going. It will take 24 hrs to update manually so be patient.