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Control arduino outputs on a web page with an arduino?

So what I'm trying to do is control, let's say and LED, that's on output 13 on my arduino over a web page from anywhere in the world. I have an arduino uno R3 and an Ethernet shield. I've looked for tutorials but I'm really new and I'm not good at adapting other peoples code for my use, so does anyone have a simple sketch I can use to turn on an LED from a webpage? 

Check the various tutorials listed on the left side of this page. Also look into setting up a UDP on your arduino. Once you understand these basics you can do a lot with your arduino and an either-net shield.

http://arduino.cc/en/Tutorial/UDPSendReceiveString