How do I flip my camera during video chatting on oovoo on Samsung Galaxy S?

I am an owner of the Samsung Galaxy s phone and I was wondering why can't I flip my camera during video chatting on oovoo. According to researching, it says that I have to get an update, which I have. i have the update 2.2.1 and I still can't flip the camera to the front. if anyone knows how to fix this problem please answer this question.How do I flip my camera during video chatting on oovoo on Samsung Galaxy S?I don't think you can using oovoo, that's how it is.