I updated my 2018 IRA contribution amount but Turbo Tax only allowed me to amended the Federal Tax Return, there was no option to amend the NYS Tax. How can I do it?

After you file

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