Connect timeleak hd capture device to HD70a BDA Analog Xbar Secondary. Right-click on the right-hand video pin of the second one and choose Render Pin. It should add some filters that allow a video preview. Right-click on timeleak hd capture device and choose the relevant input for HDMI. Could be labelled as Serial Digital, S-Video, etc. because of the dumb driver names for the inputs.
Hit the Play button and see if you are able to get anything.
If none of that makes any sense, look for a general guide on how to use GraphEdit with a capture card or example graphs on VideoHelp.com for other cards.