See the two trees? the one is plain for linking off an offsite location. the other has the blue arrow, for uploading a picture to this site. The only problem, later when other websites change and the pics go away, the link will render a dead end and no photo.
When you select the plain tree, it will say ADD IMAGE. But it really should say ADD IMAGE LINK or something like that to be clear. But it works.
Here is a link to your avatar, hosted on your site.
Here is a link to Brock's Avatar, hosted on this site. Can't tell any difference, can you? But say your website went away, so would your pic, but Brocks would remain.