I'm pretty sure that Winy BB Viewer doesn't have "file sending" capabilities. As far as I can see it can only store images and videos locally. If that's what you're looking for, the first thing that you need to do (in case you don't speak Korean, which is the default language) is to change the application's language. To do this, click on the icon that looks light a TV (on the upper side of the window, left of the cog icon) and use the drop-down menu to select English or another language that you understand. In the same menu, you can also choose where the JPEG images will be stored on your PC. To capture an image press the icon that looks like a camera.
Extracting videos from the captured footage can be done by using the last button on the right, the one called "Front and Rear extract". When you press it, you will be able to select where the video is being saved on your PC. Lastly, there's also a print button in case you have a printer.