Here are the steps to add a survey to a competition:

1. Once you get to the third step of creating competition, select Survey in the "Select Task".
2. Give a name to the task
3. Assign points for the task
4. Set a start and end date of the task

Below is a screenshot of adding a survey to a competition:

Then, click on the "Create" button which will take you to a page where you can create a new survey and add it to the competition. Refer to the articles below to know how to create a survey:

How can I create a survey?

What are the different question types in a survey?

Clicking on the "Duplicate Survey" button opens the following pop-up from where you can select an existing survey and duplicate it.