How should i change the thank you settings of my form?

Depending on the form layout you're using, please refer to the quick guides below on how to edit the Thank You Page:

Card Form: https://www.jotform.com/help/499-how-to-edit-thank-you-page-settings

Classic Form: https://www.jotform.com/help/211-setting-up-the-thank-you-page