Use the metafileds at the end of the page to modify the content.
Then rebuild the main subscription page
Go to the Apps tab, then open the APP (Website Frontend Build Tools)
Into the app go to Build Contentful Pages and click in View contentful pages
Locate the Subscription Main Page page and click on it.
A message should appear in the footer informing that the build will be executed, and in a few moments it should be possible to check the update on the website.