Can I make a correction on line 121 on the turbotax form. Amount should be 854.26 not 1708.52. I want to correct amount now before I make my payment.

The statement of investment income shows 2 entries of 854.26 each.  There should only be ONE ENTRY as per T5 box 13.
The double entry totalling 1708.52 was then transferred to Total Income Summary.  I should owe less than I paid.