In the support mode click on one of the supports it will turn white, then click on modify above or where it says add, delete, modify.
then you can click on the round base that should be larger at the base than the support itself and hold down the left mouse button and then you can move it around at an angle or even move it up into the inside of the ring or object you're supporting. You can also do this with the top of the support to move it where it needs to be if you added it to the wrong spot.
You can also right click any where including the support to see a list of options. If you select the support and right click it will give you several options as well based on the angle and such.
I'm so far behind I think I'm First !!