Okay then, I see where you need to plug it in at. In the middle of back of the board there is three slots in a column (if you lay the board flat with component side up). Match the each plug to the right slot. Now since you are using a 5.1 speaker system not all the slots will be used, I think. But if you had a 6.1 speakers like I have it all you have to do is match color slot to plug.
Actually it kind of looks like my MB in my Compact.