OK, so on the Shipping Rules page, use the Shipping Rate Calculator drop down to choose Flat. Set the amount at $23 and leave the description blank. Leave the Country drop down set as All Countries, the more specific US rule will overrule the ones we are now making. Now in the Max Items in Cart field enter in 5 and then click Submit. For the second rule, once again set the Shipping Rate Calculator to Flat and set the amount to $46. Then, just set the Min. Items in Cart to 6 and click Submit.