Why don't I...

Because in the music room there's no attachment icon.
I mean that the only way to post a pic in the music room is to use an external hosting service like Image Shack.

Just register on IS site.
Open IS page.
"Upload" must be on "file".
Then click and browse the pics on your pc.
"resize imagine": i use 1024x768 size.
Then click "host it".

Once the image has been hosted just copy the last line "direct link to image".

Open the reply window on forum and click the second button from right, on the line where you find smilies colors and so on, "display image-UBB code".
Paste there the "direct link to image" you have copied from IS and then click "ok".
Done!

Uh huh. Ta. Done it.