At the top of the left-hand column on the site pages is a box titled, "Photo posting tutorial".
In the box is a link, "Photo posting tutorial by "Shel"".
If you click on the link and start to read the instructions, not very far down is:-
You cannot upload a photo straight from your computer, first you have to host it to the web.
to do this you will need an account on an image Hosting
"Desktop" is the word Microsoft (and probably others) use to describe the screen in front of you. Therefore, a file address containing, "\Desktop" is not "on an image Hosting
Just to speed things along for you, before opening "an account on an image Hosting
site," scroll to the end of the "Photo posting tutorial by "Shel"" thread and you'll find a suggestion by a very knowledgeable person to use a particular temporary image-Hosting
site that doesn't require an account.