If you are referring to changing your filing status from Married Filing Jointly to something else you do not need to amend the tax return since that filing status cannot be changed after the due date of the tax return.
Otherwise -
See this TurboTax support FAQ for amending a tax return - https://ttlc.intuit.com/turbotax-support/en-us/help-article/tax-return/amend-change-correct-return-a...
