Massachusetts pre 1998 403b Contributions

Contributions to a 403b account were taxed in Massachusetts until January 1, 1998.  I am now retired and have begun withdrawing money, and I do not want to be taxed on the pre-1998 contributions that the state has already taxed.  Turbo Tax instructs me to enter that information on the Pensions and Annuities Smart Worksheet.  How do I access that worksheet?  (TT in the past allowed you to switch between the Interview section and the Forms section; those days are long gone, unfortunately).