You can update your content depending on its status. There are two possible scenarios:
To edit content, click on the desired email content from the listing page. This action will redirect you to the content editing page. Here, you can either create a new version by copying and modifying the existing content or start with a blank email template.
After completing your edits, remember to save your changes as a draft. Keep in mind that only when you publish will the changes replace the current content in production.
PublishJust saving a draft will not replace the existing content. You need to publish the new content in order to update the existing content with the changes you've made.