How to change a global variable?

Hello, how do I change the global variable “List” in the image above. I would like to create a scheme that when pressed in “List_View_Image_and_Text1” would change the title for example “Karin Boor” to “Karin Boor :ballot_box_with_check:”. I would like to create an application with which I could mark/unmark which vehicle I have from the game.