Assuming it's not just a case of taking up the slack in the handbrake cable, then what you need to is
Jack up the car
Remove a bolt from both wheels
turn the wheel slowly, looking in the hole until you can see part no.3
Using a screwdriver turn the segmented part on part no.3 until you can longer turn the wheel by hand
Turn the segmented piece the opposite way 9 times to free off the wheel.
There are further instructions on the TIS but unless you are getting into the handbrake operation and forces applied at certain points in the handbrakes operation I'll not go there at the moment.