It took me a bit of time to understand but I made it :-) taking a picture of full moon is not easy in the beginning because the logic is a bit counterintuitive. When I started taking pics of the moon, it was always too bright with sort of allow around the pic... It was OK but I could not see details of the moon.
Today I used an other setting AND a tripod, that is very important because even if you take the pic with fast speed, the camera needs to be perfectly stable. Then, aperture f4 and speed 800 with 200 ISO :-)