On a page, click the pencil icon for the content element you want to edit, then edit the text and make other changes as required.
You can also change the content element type by selecting a new element from the Type list.
When you change a content element's type, the TYPO3 CMS reloads the screen to display different input fields.
This action does not delete content. It is saved in the background and will be restored if you select the applicable content element type again.