Go to "upload/manage" and add a new account profile.
Press Add and then select Use an existing account on other server and press ok.
Enter the ftp type, server name, username and password. If you don't know what to enter here, ask those who run the web server for you. The ftp address is usually of the form ftp.yoursite.com or www.yoursite.com
Finally press Connect.
jAlbum may proposes a folder location for the album on your server. If it doesn't just select the folder where to create the album folder and click the add folder button.
It's very important that all albums on your website is placed inside sub folders. If you publish directly to the web root the album will/may overwrite existing content on the website.
The album needs to be in the web root of your website, the web root is usually called public_html. If your web root is called some thing else, you will have to right click the folder and select Mark as web root. If the address shown in the pop ups is not correct you need to edit it. It should be your website address, for example: http://myalbumsite.com
When you're ready, hit Upload. To make jAlbum remember this location for future updates to this album, save the album project before quitting jAlbum.