Remove render blocking resources

HI! I have been using Hummingbird to improve my website performance in order to rank better with Google. I have improved many elements, but I cannot get one item to budge no matter what I try (I am not super technical, but I can follow directions, haha). “Remove render blocking resources” is at 24% and I have tried to follow the directions in Hummingbird, but I have not be able to improve this element. Can you share more info with me as to what I need to do to get this number higher?