How to do so that the respondent can only answer the survey once?

User Support Data Collection
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Lo que busco es que el usuario no pueda responder 2 veces la encuesta

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Do you use Collect or Enketo (Webform)?

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Utilizo Enketo (Webform)

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You may have a look at this Help Center article Collecting Data through Web Forms — KoboToolbox documentation. Online-only (once per respondent)*

Furthermore, you can find more hints with the search function of this forum, e.g. Search results for 'limit submissions to one only' - KoboToolbox Community Forum.

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