how to find my nationwide passnumber

I have attempted to use online banking with nationwide (twice now) The first time the pass number was barely visible and what i attempted to type in got me locked out….so i re – registered this time i logged in (once) but it became clear to me when i tried to log in the second time that the digits i barely made out from the pass number sheet was pure luck.:( My question is does anyone know a special technique for deciphering the nationwide pass numbers from that black strip thing you have to pull off?