Where are you trying to "upload" it? There is an upload feature here for attaching a file to a post... that feature actually copies the file from your hard drive to DocJohn's server and puts a link into that post.

For the profile avatar (picture) though it is asking for a URL to a photo that is available somewhere on the web (with a web address). The picture first has to be uploaded to a webserver so that it has an accessible web address, and then you type the url in to the profile page.

People will not be able to see your pic if you link it from your hard drive because your computer is not a web server... a good thing because you don't want people on the web accessing your files. To display the pic, the web browser loads it from the web server... following the URL link, each time someone loads that page on their computer. You wouldn't want people accessing that file on you hard drive every time they open a browser window displaying that pic, even if it were possible to do so.

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