There are few methods to do so.
- Go to Epics listing view and Select the Linked User Stories option provided next to each Epic. You can view these User stories in 2 modes; minimized and expanded.
- Minimized view only shows ID and Title.
- Expanded view show Sprint ID, attachment and so on.
- Edit View of Epic
- Go to User Stories Tab and view existing association, modify or add new User Stories to Epic.