Can someone help me how to get a icona in a fan club?

unless te created the club te cant change the icona on your own. make a pick on the spot asking other fan for their opinion and to give them a chance to invia new ideas as well. once the fan have chosen te can message papa o dave and they will change it
for più info (and i do encourage te to read it cause this is just the basics that i put down here) read this article:
link te will find your domanda answered at number 17!

and te should read the whole thing cause dammit its pretty good!