You have to host the song first, you can make a site at myspace or purevolume if you have a band or there are some sites that will host them free, although the links escape me at the moment.
To post a picture, you also need to host it somewhere like photobucket.com, once you upload that picture they have an actual link you can copy, it's the one with the [IMG] in front and behind it. Otherwise we have the [IMG] tags right on the BBS here.
