is it the wrap round one?
If so....2 mins let me think bout this.
Ok i think i remember now, open the boort and iirc theres two screws on the top like at the top of the rear window. Unscrew them, might be caps on em or summit cant remember exactly. Also, theres two plastci clips on each "arm" bout 3/4 of the way down. You will need something flat, thin and sharp. Then like pry the spoiler off as it will be held on with thwat stupid tar like stuff that Nissan so seem to love!
Then just pry it away, i may be wrong though...