How can I correct dates received in the underpayment Statement for NYS? TT spread out the withholding over the full year which results in an underpayment.

I receive income from three sources over the year.   2 provides a W-2.  The third is a Fellowship grant that does not withhold taxes.  I made an estimated payment for the income received from the fellowship.  TT spread the amounts withheld over the year instead of 6 months resulting in an underpayment of NYS taxes.  How can I fix this?