wht can be a html code to move a selective (nextor previous) page inCaldera form

I have 8 pages in a form built by Caldera form and need to move to a selective page through writer’s filling condition.
For example, in the 2nd page, a writer chooses one from dropdown selection, and when the writer clicks ‘next page’ button, he move other page corresponding to the selection in the 2nd page.
And also when clicking the previous page button in the moved page, I want to move back to 2nd page from the moved page. That is(for example), 2nd page to 5th page by clicking ‘next page’button according to a dropdown selection, and then 5th page to 2nd page by clicking ‘previous page’ button.

Are there any one who can help me ?

Thank you.