VuPoint cheap ST16B digital camera--how to ...

I've taken the 18 high-resolution photos allowed, saved them to my computer, & now want to erase those & take 18 more. there is no button on the software program that came with the camera to allow delete, trash, or any other way of discarding images. The printed instructions say nothing about this either. Any idea how to wipe the slate clean & begin anew? Thanks a lot for your help! Theresa Dolan, Los Angeles