You can correct this in the Data and Analysis tab.



Under tools, ensure the column you would like to edit is visible using the Tools>Choose Columns Dropdown menu.



Then click the !

Edit button and edit the appropriate row of response.

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For a participant who does not have access to the survey administration page, they would need to receive a retake response link in order to overwrite their own answers. The administrator can also do as @AnthonyR suggests, however the edits will not be reflected in the legacy dataset.

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