Sometimes WordPress caching might prevent the auto redirect, status refresh or updates from ChatPress. In this case, simply refresh your WordPress admin page to verify your changes.
You can select as many pages or posts as you wish as long as they fit in your allowed quota as per your plan.
If you need to add more pages or posts after your chatbot is trained then you can do so from the Trained Pages section.
Once you have selected pages or posts you want to train the chatbot on, click on Start Training. You will then be redirected to the Settings section.
If you need more pages then upgrade your plan.