Change of spotlight bulbs
Very common type of under cabinet spotlight, unfortunately it comes with both LED and Halogen types and in some cases its not easy to see what lies behind the colored or forested covers.

For the halogen type bulbs good auld push and twist should do the job releasing the old bulb so if this is not working for you don't try too hard its probably not a halogen light bulb.

For the LED fittings there is usually an outer rim which can be popped out with a small flat head screw driver. These fittings can easily be scratched so be gentle while trying to pop the rim, small piece of electrical tape on the tip of the screw driver would do miracles not scratching metal or plastic fittings like this!