Yeah, there is a tab on the side of each one. Press the tab towards the rest of the lens, and pull the whole lens downward. Its a little tight in there, but as long as the tab is pressed, it will come out. I used a little screwdriver to pull it down while pressing the tab.
Sorry for the delayed response - we were traveling today. I am doing this from memory as we don't have the Camaro with us - for the License Plate light lense I believe there is a tab on the left side of each that you gently press in to release the housing. The housing should then come down enough to remove the bulb. I'll be back Tuesday if you still have questions - Tom