I had trouble with the directions on BYC - I had to click browse and then right click "cut" on the picture I wanted, then move to my post and right click on "paste" rather than use "copy". That might work for you. I still can't figure out how to do the avatar- if YOU figure that one out, let ME know!
Just go into uploads, then copy and paste the URL into the question, and yes the URL cames up as writing in the question but when you preview it, it will show pics! Hope I helped!!!