Atari 5200 Configuration Assistance for a total newbie

[telemann]

Hey friends, I recently setup my Raspberry Pi 4B (2GB) with the retropi and has been great so far. However I've been having a very difficult time getting my Atari 5200 roms to work.

I'm trying to follow the instructions here:

https://retropie.org.uk/docs/Atari-800-and-5200/

And I have already installed the 5 BIOS files in the BIOS folder but I'm having a hard time understanding how to exececute this step:

***Atari 5200 setup
In both emulators, the atari.cfg file is shared between Atari computers and the 5200. In lr-atari800, the core options likewise apply to both by default. However, for either emulator, if you have a core options file in your atari5200 directory, it will let you have separate settings for just the 5200 system.

Make sure you have a file called /opt/retropie/configs/atari5200/retroarch-core-options.cfg with this in it:

atari800_artifacting = "enabled"
atari800_cassboot = "disabled"
atari800_internalbasic = "disabled"
atari800_keyboard = "poll"
atari800_ntscpal = "NTSC"
atari800_opt1 = "disabled"
atari800_opt2 = "disabled"
atari800_resolution = "336x240"
atari800_sioaccel = "enabled"
atari800_system = "5200"***

I am not an expert in programing so I don't know what it means to place a file with that name and contents.. Also I don't know how to create that file, I don't know what type of file it is.. and lastly I don't know where the file needs to be placed.

I know most of you guys are probably so annoyed with my lack of understanding.. I am usually pretty good understanding instructions but with this one I am totally lost.

Your help is greatly appreciated.