I wnat to replace the

Hi there. If you just want to replace the plastic cover on the phone which is on top of the lcd screen then get a small screw driver and lift off the plastic from the top where the ear piece is situated. The plastic cover will lift of quite easily and you then just replace the clear cover with a new one. Make sure that you are in a dust free area so that no dust is trapped between the plastic screen and the lcd screen. You should be able to buy the plastic screen covers from ebay for under £5.
Hope that helps.
Gary

the lcd screen? hmm is it blank or cracked ... probably I would chuck it for the new cells are free with a contract, but if you have to ...
contact the manufacturer and order and a screen and get a set of tiny screw drivers to open it .. some are tricky and you need to figure out where they hide the screws or if pries open... then the fun begins.

good luck