How to get page index So I can go to the next page?

Please read this guidance.

People in this forum, other than you, can not look at the HTML source code of your Application Under Test. Without looking at the HTML source, nobody would be able to answer to your question.

If the URL of your target web app is public, please tell it to us.

If it is private and you can not disclose it for security reasons etc, others can not see it on browser on their PC. In this case I can not help you.

If the web app is private but you can disclose it to others, you can download the site using wget and zip it. You can post the zip here.