1. Locate your Web App in your Web server. It could also be your Quark Publishing Platform server or QuarkXPress server folder.
Example:
C:\Program Files\Quark\Quark Publishing Platform\Server\webapps\webreader
2. Open the file 'reader-config.json
3. edit the Auth section as follow.
'auth': {
'authToken': 'myAuthToken',
'launchLogin' : false
},