You make a pick. Have a lot of fans answer. Then contact the staff of Fanpop. Of course, if the person who made the club still runs it (meaning they haven't left), then the process should be easier. If you're the owner, you go to the edit button on the tuktok right of your spot.
1) Make sure people wants the icon and banner to be changed. 2) Have people suggests larawan for the banner and icon. 3) Make a pick using the larawan that were suggested (also make sure the tanong is along the lines of "Which image would you want the new icon to be?") 4) Set a due petsa to about a buwan or so, that way enough fans would answer it. 5) Go to the bottom of Fanpop. There will be blue words. "Contact Us" is on the right side. Send the link of the pick, the image, and a description.
..I'm going sa pamamagitan ng what I've heard around the site. I'm not sure if any of the steps are wrong since I haven't contacted the staff yet.