How can I add another page based on the answer to a question on the first page?

If the answer is yes, how can they be redirected to answer additional questions?

You can add another page by using the "Page Break" tool.

You can use the "Skip to a Page" condition so that once the user press the next button, the form will jump to the assigned page depending on the selected answer.

Here's the sample condition:

Hope that helps. If you need any help, let us know. Thank you.