Probably, you would rather run it by clicking an icon. This instruction assumes that you are using the Gnome desktop and Xandros came with java already installed. We will also assume that you put the jgnash-1.10.6.jar file in your "Home" directory. (Not on the Desktop)
Right click in a blank area of the Desktop. Select "Create Launcher." Put the command, "java -jar jgnash-1.10.6.jar," where it says, Command. Put "Jgnash" where it says, "Name." Click the button that says, "No Icon," and pick an icon you like. Click OK. Then double click the icon and see if it works.