Oops, not at my PC, but looking at the guide, I think I may have missed out a step on how to get to the screen - on the screen after choosing your video source, there should be an option to check - I'll take a look tonight.
If you've gone through the wizard and you haven't got to the clip frame option, click settings, then advanced, then select clip frame.
You can download TMPGenc from here
http://www.tmpgenc.net/e_main.html