I have Adobe Acrobat version 9.0 and it no longer has the little cammera icon for capturing to the clicpboard. You can still do this, however by clicking on edit and scrolling sown to "Capture to Clipboard"
If you already have the cheap version of Photoshop (elements), like I do, you can open any acrobat (.pdf) file and then simply crop what you want and save it for uploading.
I have also downloaded a free print driver called pdf995 which allows you to print anything to a .pdf file. Which then can be opened as Bob said or cropped in Elements, saved and uploaded.
Anyways - have fun.