Hello, so sorry for the delayed response....missed your comment. So, choose the likelihood to your question, and roll 2d6 & d8. First, just compare the d6s to the Target Yes number, 6, 8, 10 (depending on the likelihood you chose) - Then compare those d6s to the d8, and follow the instructions. if both d6s are less than the d8 = but, and vice versa for over the d8. If the d6s split the d8 (meaning one is over and the other is under, it's a straight Yes)
Hope this helps, and again my apologies for the delay