Investors & landlords

I exercised (same day) NQSO and received a 1099-B from Broker, but there is no number in Box 4 (Fed income tax withheld).  Only Gross Proceeds (Box 1d) are entered on my 1099-B.

I am retired and no longer receive a W2 from my employer. When I did work - this info would be included on my W2.  In TurboTax - where do I enter the tax withheld so I don't get taxed twice?