How Do I REPLACE the Gas Cap Rubber Cord from the Gas Door? on 2006 Mercedes-Benz SLK280

As it is attached to the Gas Door an there is no screws to remove it..
It is a Black flat Plastic piece so have no ideal how to get that off the door if I use a screw driver it most likely will break the plastic clip..
Help Please

Asked by for the 2006 Mercedes-Benz SLK280