Move to SaaS Subscribe to customize SaaS Subscribe Section.
Click on the Customize button on the top bar you can see the edit icon on every section on the pages click on the edit icon of the section you want to edit.
After clicking the edit icon, a left sidebar displays customizable options of each and every element that are present in that selected section now you can start editing.
In customization, there are pricing plans (Basic plan, popular plan, premium plan) you can edit the price plan. the easiest way of customization is here. Enjoy!