shaun,
i think the tab just says Settings in MKtool, it's the one you use to get access to all the tabs for changing the FC settings. Hold Ctrl and press the Settings button at the same time to see the Bl's page in MKtool. I didn't even know it was there until just recently. Pick the BL you want to reverse and there's a box to check. save it to your boards and it should work.
Remove props before testing any motors indoors. Don't ask, just trust me (and Dave).
Bart