I want to fly my tricopter tail first

I m new in this forum. I have ben in the drones industri sins 2007 but now I had a new projekt.
How do I set up the tricopter with the tail (now nose) -servo or y-6 in the opposite flight direction?
Please help me out. I have use this setup for a race drone before but not with Ardupilot system/software.

best regards/Claes in Sweden