Wire the Power company lines to VFD input 1-2 or A-b or whatever the first two input terminals are designated. The manufactured leg might best go to terminal C or three or whatever.
The input to a VFD is an AC supply into a DC rectifier. Very forgiving of voltage balance etc. That said, used at full rating, a VFD will tax the electrical components inside and a RPC with voltage balance is advised.
An oversized (2X) VFD compared to the motor load, could operate on single phase input, giving 3ph output. But you have what you have.