2008 Roomster dashboard air vent removal

Hello,

The central air vent on my dashboard has one of the vanes loose and doesn't move with the others. I tried moving it to see if it'd click back into place but no luck. Its more just annoying than anything else. How do l remove the vent unit to inspect or repair it from the back. I tried prising off with a screwdriver but was afraid to use too much force in case it cracked. The unit has a driver and passenger face air vent and controls and also the hazard switch. Has anyone removed one of these? Thanks