I mean that
snipfly is not an application included by default in the Bitnami server so you add it there somehow, installing, copying the files, downloading and uncompressing, the method is not important.
The thing is that you are adding an external application to the WordPress Pro stack which uses Nginx as web server. Therefore, you should follow the guide I already shared with you (this one)
Please let me know if there is something you don't understand from the guide or if you find any problem with it.
No, your current configuration uses Nginx and you don't need to change the web server to Apache.