Amazing, you actually want me to help you out after you have demonstrated that you are obviously a pretty rude individual.. I have been looking at your other posts, and *** seems to be an integral part of your vocabulary...
Well, as I am not at all like you, I will elaborate.
1. Take the airport express out of the box.
2. Plug the airport express into the wall (mains power supply)
3. Run the Airport Express set up assistant
4. Create your wireless network
5. Using the appropriate cable, connect your airport to your existing hifi
6. Turn on your amp
7. Select the appropriate input
8. Run itunes and select the required song
9. In iTunes, change the output to the airport instead of the computer.
And hey presto, you have a wireless music system... My 8 year old daughter managed to do it, so I am sure you will not struggle. It is all there on the website, you just have to look...
http://www.apple.com/airportexpress/