I would like to know how to Record my screen along with the webcam. I would also like to know how to toggle between my screen and webcam.
Recording two sources is only possible in Picture-in-Picture mode, see ManyCam Picture-in-Picture feature – ManyCam Help and Support
If you need to switch between different presets containing various video sources, you can simply click on them or use the Hotkeys (set them up at Settings > Hotkeys).