In order to access all features of App Radar, the App Radar user you have invited to your App Store Connect (formerly iTunes Connect) needs to have certain roles:
Sales: Required for Sales Metrics in App Metrics Feature
Customer Support: Required for Reviews Feature
Finance: Required for App Metrics Feature
Marketing: Required for Store Listing Editor Feature
These roles are needed to use all features, but work independent from another. If you choose not to give the permission to all roles, you can still use the features were you give permissions for.
Without the connection, you can still access features like: