For content authoring, you can simply go to dam assets, and edit the content fragment; here you can edit content based on how your content fragment schema is setup.https://docs.adobe.com/content/help/en/experience-manager-64/developing/extending-aem/customizing-co...
To display content from the content fragment you can have several methods, but these are the popular methods that I've used in the past:
API: When you want to expose Json to 3rd party services, you can utilise the WCM Core Component V2 Page, and also the WCM Core Component content fragment component, you can call model.json on the page, and see the basic structure of the content fragment values presented as the JSON response.
I hope this helps.
Please follow the below steps:
Detailed Documentation can be found here https://helpx.adobe.com/in/experience-manager/6-3/sites/authoring/using/content-fragments.html
Exactly how are you planning to display it ?