Move it 10 houses forward to the 9th house.
The 12th house represents what we give, our sacrifices, and our secret lives. The Upapada Lagna is the manifestation (Arudha) of that energy in the physical world. It reveals: Upapada Lagna Calculator
Count how many houses the 12th Lord has traveled from the 12th house (including the house it sits in). Move it 10 houses forward to the 9th house