Tailgate spoiler removal

Hi everyone hope you can help.

The painted part of the tailgate spoiler on my son's Micra vanished over the weekend, not sure if it was nicked or got caught by the wind. I have managed to get a second hand replacement but can't work out how the painted part detatches. I don't have the car with me until next week when he is coming down before Christmas but want to be ready to fit it when he is down. Any guidance gratefully received.
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