Then just call the methods as they are static.
IE:
Logger.WriteToLog("test test");
WriteToLog(string logMessage)
Call this method and pass a $ formatted string by itself to inject that string into the log file on disk.
WriteToConsole(string logMessage)
Call this method and pass a $ formatted string by itself to log that formatted string to the Unity console.
WriteToConsole(string optionalMessage = "", int optionalInt = -400, float optionalFloat = -400)
Call this method and pass the optional values to log those values to the console.