Filing PND.94 for rental income

We have the rental income in the year, but we did not file the half- year tax (P.N.D. 94), how can we do? Panwa: You need to file the half- year tax (P.N.D. 94) and pay the penalty and surcharge: Penalty 1.5% of the amount of tax payable (if any) Surcharge 200 Baht....