Welcome gioia!
Such like me -- when I joined here, I haunted people to help me with avatar. Go on little face button called 'Profile' below the main bar, and then to' Forum Profile Information' where you will see one empty gap for Photobucket link. (you must upload the photo firstly on that host site, go
www.photobucket.com and create an account there). Or just do copy a link of your favourite image from any site you would love to be your avatar.
I hope I helped.
P.S. I suggest to mods to remove this topic/posts to somewhere.