Before posting a render you must make sure you - Provide a link to the original render - Have permission if needed to be able to cut it out from original. - Link to the site which the render was obtained from. - Did not ask for rep or credits. Your render was removed because you did not follow all of the guidelines above. Editting this post without fixing the things you missed before will result in a warn/fine.
To make it transparent, save it as a gif (bad quality ) or what we all do... PNG! it may look like theres a BG if your viewing a PNG on IE (internet explorer) but when you save it to your computer it turns transparent. *Edit* Pic finally works for me take what you have now and just recut it, cut out the black save as png and there, its not that hard to recut it since it seems to be a simple cut...
Please provide a clickable direct site link (not image host link) to your original image and rehost your render.