If you use Windows XP or bellow you can go to Start > Control Panel > Add or Remove Programs. In the Currently installed programs box, click on the jetAudio program and then click Remove.
If you have Windows Vista or above you need to go to Start > Control Panel > Programs > Programs and Features. Select the jetAudio application and click on Uninstall.
Also you can use some uninstallers like Revo Uninstaller, IObit Uninstaller or Advanced Uninstaller PRO. All of them are free of charge and easy to use.