If you've signed up, there is an account at jalbum.net waiting for you. This is how you publish to it.
First, make sure you have made an album and that you are signed in to the application. If you did not sign in when you started the jAlbum desktop application, click on the "Sign in" button in the top left corner and then "Make" the album again.
Now upload your album to the Internet by clicking the "Upload" button.
Your album is now online and it's time to show off your fine work. After publishing you will be presented with a page with more options for your album, like sharing your album with friends through email, social networks and more. (You can always reach these options from your Albums page when you're signed in on http://jalbum.net.)
Enjoy the result of your work, click the link with your album name and check out your masterpiece.