Under the menu item 'View' you have the option 'EDI Editor' plus you have the EDI icon on the toolbar to invoke the EDI Editor.
EDI files are often hard to read, especially if they have no carriage returns and line feeds to put each segment on a line of its own.
When you have no file open than the file dialog box opens and you can navigate to the file that you wish to see.
When you have a file already opened, and you click this menu option, the editor will open and the following screen will appear
The EDI Editor
When you right-click anywhere in the text, a floating menu will appear with typical test edit options such as cut, copy and paste,
The floating menu of the EDI editor. right-click anywhere in the text to make it appear
Typing Ctrl-F brings of the text search utility
The search utility
Ctrl-H will bring up the replace utility
The Find and Replace utility
If you make changes to the file, the 'Save' button becomes enabled and you can save any changes. The HIPAA Authorizer will further on work with those changed files, you don't have to open the file again.
Changing EDI files can be a tricky undertaking. You should be experienced in the format of the 278 and understand that an 278 claim file could be a legal document that should not be altered without the consent of the originator.