Removing rear lenses cover

Good evening all, this is my first post so be gentle. I have a ford transit autosleeper duetto two berth 1996. I am trying to remove the rear plastic lenses cover so that I can change so.e bulbs. I have checked the haynes manual but still cant make sense of the instructions. Sorry to be asking questions on my first post but I have a MOT booked at the end of next week. Your help would be most appreciated.
Regards  Alan

Here you go...
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Thanks for your quick response, you are a star. I will give it a go and save some money at the same time, I hope !!  Very much appreciated.   Alan

 There you go, help already.
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Richard