Crediting icons is easy.
From your profile page, you can click on the userpic on the right or you can click on Profile at the top of your page, and a drop-down menu should appear. Click on
Edit Userpics.
From this page, you can upload new usperics, delete userpics or edit them. In order to credit, simply type the icon-maker's name in the comment line. See the graphic below:
graphic courtesy of
koalathebear If you have any questions, please let me know and I will try to clarify.