Normally four at the front of the car aswell. Put the car on axle stands,or up on ramps,then have a look around the front end from underneath. Should be 2 blots/nuts on either side. Then undo the plastic arch cover where there should be a few more but mormally screw type things.

brute force and ignorance usually works too , but then it wont go back on , seriously though , buy an haynes manual , i been a mechanic over 10 years n i still getthem for my cars , they can save a hell of a lot of stress , and if you dont know how the bumper comes off you'll be guaranteed to miss a bolt and end up crackin the bumper getting it off , £15 quid manual or cost of a new bumper ?