I need to fill a NYS IT-237

TurboTax does not support form IT-237. 

The only way to enter the credit in TurboTax is to use an override which can only be done in TurboTax desktop. However, an override cancels the TurboTax accuracy guarantee.

To claim the credit, switch to TurboTax Desktop and check CHAMP rjs response 

How do I switch from TurboTax Online to TurboTax Desktop?

You are entitled to claim this credit if you:

• rehabilitate a qualified historic home in New York State, or
• purchase a rehabilitated qualified historic home in New York State.

A qualified historic home must be an owner-occupied residential structure (including a condominium or cooperative) listed on the State or National Register of Historic Places, or located in a state or national registered historic district and certified as being of historic significance to the district. The home must also be located in:

• a federal qualified census tract or area of chronic economic distress, or
• a census tract that is at 100% or below the state family median income level, or
• a city with a population of less than one million with a poverty rate greater than 15%.

NY.gov