what year is it, if it is the earlyer shap one, open the bonnet and you will find behind the headlight there is a rubber cover about 3inches across pull that off then you will see the wires going into a block, pull the block off then either side of where the block was you will a chrome metal wires,
push these towards the headlight and together, they will unclip and drop down allowing you to take the bulb out and put the new one in, then reverse the proceedure for taking them out.
hope this helps