How do you notify TurboTax of errors?

Doing taxes for family, need to do Form 8615 (children's unearned income tax based on family income).  The 8615 worksheet (#3) has been renumbered by TurboTax from the IRS original, and someone got confused about the instructions for lines M through R.  For instance, line M says, divide line C by line M (obviously impossible!).  Generally the program puts the right amounts in anyway, but the amount on line Q seems to be wrong.

 

Generally TT works well.