Unfortunately, you can't. If one makes a copy of a "locked" return, the lock copies over too. We're working on removing the lock on a copy, but there's currently no scheduled release date for this enhancement.
Are you attempting to edit the copy because you want to file an adjustment? If so, here's how you file an adjustment: https://turbotax.community.intuit.ca/replies/2647992
dahlia-p
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titaniumbones
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jgtwhittaker
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GT43353
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