For estimates for next year's taxes, if you've elected to apply your refund from this year toward those payments TurboTax does not have a way to adjust your remaining estimates in TurboTax online. It applies your refund to as many periods as possible, and then creates the final voucher(s) for you.
If you're using desktop, you can adjust them by manually adjusting in Forms Mode.
If you want to break that fourth payment up throughout the year, you may, but if you're using TurboTax online you'll need to prepare form 1040-ES manually outside of the TurboTax program.
You can find the blank form HERE.
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