to show an extra page you can use a visibility condition based on a boolean variable to apply on this extra page and use an "on change" event applied on the field where the user input "Yes" or "No".
To use a visibility condition you can refer to this article of our Knowledge Base https://www.webratio.com/learn/learningobject/getting-started-with-visibility-conditions-v-72.
The "On change" Event is used to activate the visibility condition, in way that when the user insert "Yes" or "No" and the focus on this field changes, the "On change" event is triggered and allows to reload the screen and update the visibility condition.
To use this event you will need to model an outgoing normal navigation flow from the form, for example connected to a "Parameter Collector" to pass the value that it will have an OK Flow that returns in page and set the value in the variable.
To apply an "On Change" event, in the Outline View select the field where the use insert the value "Yes" or "No", move to the Properties View and select the AJAX tab.
Activate the “Enable Event” property and choose On Change in the “Event Type” property. Then select the normal navigation flow outgoing from the
Form Component as “Event Flow.”.