I tried right clicking on my project (in Eclipse) android tools->Export unsigned application package.
I then moved to .apk file to my Samsung Galaxi S device and tried to install it,
I got a message saying the app was not installed.
Did I do something wrong in creating the .apk (what could be the problem)?
If you want to install the application with debug key then you need device driver(Kies in your case) installed on your development machine. Then attach your device to your machine through USB port. Close emulator and run your Android application on your device using Eclipse. The signing procedure mentioned in previous answers is mandatory only when you are uploading your application on Android Market.