To start an interview, locate the survey in the survey list, then tap new interview :
.
The interviewing screen appears:

Use the various on-screen controls to record the respondent's answers. You can navigate through the questionnaire with the back and next buttons:
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You can abandon an in-progress interview by tapping
in the top left corner.
An alert appears:

When you complete the last question of a survey, you are prompted with the following alert:

Respond to the alert as follows:
New interview: immediately begin a new interview.
Cancel: return to the list of available surveys.