Question about configuring the config file

I'm trying to download PHPlist and I had to reconfigure the config file which I had put into notepad. My problem is what do I do with it now? I assume I need to move the reconfigured one back to the original config file. If so how do I do this.
If not then what do I do next?
donrock

 

Save it as the config.php file then upload and replace the other config.php file.