I find it difficuit to remove the rear light casing to change a bulb on my nissan X-trail. How can it be done?

I need to replace a blown rear stop light bulb on my Nissan X-trail but the light casing is difficult to remove after unscrewed the visable bolts. I need to know how to remove the light casing ,but I'm not sure what is holding it in place and i do not want to apply to much force to break the casing.I find it difficuit to remove the rear light casing to change a bulb on my nissan X-trail. How can it be done?buy you a manual this not being smart to you all auto owner need a repair manual