well u could always create an account on photobucket and use them from there... or u could do that on Facebook also. Just add the pics and use the picture hyperlink.
You can also read through this thread there is a lot of info about posting pics this thread is a sticky in the gallery section. Hope it helps you like it did me. I use photobucket
Just click Manage Attachments below the text box (in the Additional Options section), a window pops open, then click Choose File, then Upload. Is that what you are doing or something different?