Undo tax filing to file jointly?

I filed my return and got my refund already but we decided that we should have filed jointly. Do we have to amend my taxes to filing jointly? Or can we file his jointly and get rid of mine somehow?

Get your taxes done using TurboTax

Sorry if he hasn't filed yet you have to amend your return to be Joint.
How to amend a 2016 Online return      https://ttlc.intuit.com/questions/3402261-how-do-i-amend-my-2016-turbotax-online-return

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https://ttlc.intuit.com/questions/1899507-how-do-i-amend-a-separate-return-to-married-filing-jointly

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