At the risk of sounding like a complete IDIOT

, could somebody pretty please help me??? I have never used umbrellas and brackets before. I remember seeing a video Wil Crockett did of the right and wrong way to put one on the bracket and stand, but darned if I can find it now. Anyway, what I'm wondering is this... aren't you supposed to be able to angle the umbrella as well as the flash? Or angle the umbrella with the flash?? I'm doing a shot where I want two umbrellas up high and angled down over the group -- but I how can I do that if the umbrella goes in a slot below the part that you can adjust the angle? Or am I doing something wrong? I just don't get it. I didn't get the bracket that was recommended by strobist, but the one they had that they recommended because the other was out of stock (LumoPro 679 from mpex.com).
I'd really appreciate any input, I'm totally lost here and feel like a complete moron! Used softboxes before so this is new to me... oh well, not too proud to ask for help, I guess!!!