My mac is about ten years old. What is a "two finger click"?. On mine, you can't click the mouse pad part, and it only has one button you can press under it. If I click it twice, it just takes me to the next picture.
go to settings---> track pad settings(something like that)-----> click the box that says hold shift to double click. Try holding shift then clicking on a picture. or try holding control and clicking
Got decals for an '08 Ollie through Cove which is my local Devinci dealer. Find your local Devicn idealer and you should be able to get some through them