For now, only TheTruthSpy version for iOS iDevice (iPhone, iPad, iPod Touch) supports remote uninstalling feature. To do this, you need to set a monitor number then use that monitor number to send SMS command <*#93> to target phone number (phone which TheTruthSpy is installed). Monitor number is not target phone number. Email and password are email and password of your TheTruthSpy account.
But for all platform versions you can go to user control panel (http://my.thetruthspy.com) to go to settings and you can see more options in that you can click 'uninstall remotely'. Next sync the application will be removed automatically from target device.
Or if you have chance to keep in your hand the target device, you can uninstall/remove the application like normal applications.