Google it and you can get the instructions.I did mine,it,s easy and costs nothing as long as you have 2 keys already.
From what i can remember you turn the ignition on and off 8 times to open the code reader in the ecu,wait for a beep then put in the new key and start it.Get a fob off ebay for £5 and then get a blade cut for £5 ,job done.