You would be adding 2 different shipping rules to accomplish this. One for the 5.95 and one for the 9.95. You would open your eCart Object and go to Shipping tab. Click the Add button and put in a name for the rule. After this, you would want to click add under the Triggers tab. Select Subtotal for the entire cart contents, <= and input 15. Then in the Calculation choose Based on the cart subtotal and choose plus and put in 5.95. You would want to do the same for the other rule except choose > instead of <= and 9.95 instead of 5.95.