I'm sure some of you Linux pros already know how to do this, but I wanted to help the Linux newbies too.
First, you must open a terminal. Usually, most Linux users already know how to do this, but depending on your desktop environment, you'll find it in different places. For GNOME, it will be under Applications with the name "Terminal". Just browse through the menus until you find it.
For KDE4, just search for konsole in your search box on the K menu.
For KDE3, it should be under K menu > System with the name "Terminal" or "Konsole" or similar.
Okay, assuming you have a terminal window open, type this: "cd ~/.wine/drive_c/Program\ Files/Blockland", without quotes, and press enter.
Now, type this without quotes: "wine blockland -dedicated"
Assuming you have already port-forwarded, you will now be hosting a dedicated server! Good luck!