Looking to amend 2017 nj state
See this TurboTax support FAQ for amending a 2017 tax return originally completed and filed using TurboTax - https://ttlc.intuit.com/community/amending/help/how-do-i-amend-a-return-in-turbotax/01/27372
See this TurboTax support FAQ for amending a State tax return - https://ttlc.intuit.com/community/amending/help/i-need-to-amend-my-state-return/01/26510