By default, your participants can only vote once per device.

However, for Open Ended and Word Cloud, you can give your participants the option to submit more than once! So when creating those questions, all you need to do is toggle the button "Let participants submit multiple times":

When you have activated that feature, your voters will receive a prompt to submit more answers after they send in their first response for Open Ended or Word Cloud:

See also: Can audience members vote separately on a shared device?

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