Look at the UserLogger object in the user guide and you can see how to use it.

UFT User Guide > API Testing Design > Writing Event Handlers for API Test Steps > Reference > API Event Coding Common Objects > UserLogger Object

Example:

Context.UserLogger.Info(''This is for info string'');
Context.UserLogger.Debug(''Debug Mode'');
Context.UserLogger.Error(''ERROR EXIST'');
Context.UserLogger.Fatal(''Fatal code here'');
Context.UserLogger.Warn(''Warning string here'');