If you've located GameUserSettings, you've done most of the work already! There won't be any settings from mods in there yet, as you have to add them manually. Scroll down past the lines of Server Settings and add a new header that simply says [Shiny]. Underneath the header is where you want to put any settings from this mod that you would like to manually change. In your case, it would be the DinoBlacklist, SpawnIntervalMin, SpawnIntervalMax, DinoLifetimeMin, & DinoLifetimeMax settings. So type these out on separate lines below the header.

To blacklist specific dinos, you will need to know the Entity IDs of the specific dinos that you want to prevent from spawning. The Entity IDs can be easily found here[ark.wiki.gg] on the ♥♥♥♥♥♥♥♥ ark wiki. For example, if you want to prevent both dodos and piranhas from spawning in as shinies, you would add "Dodo_Character_BP_C,Piranha_Character_BP_C" after "DinoBlacklist=".

As for Spawn intervals & Dino lifetimes, the value you will want to add will be the minimum and maximum number of seconds you would like for the game to choose between. So if you wanted a shiny to spawn every 30 minutes without fail, you would put "1800.0" after "SpawnIntervalMin=" AND "SpawnIntervalMax=". Additionally, if you want shinies to last for 18-24 hours instead of the default 6-8 hours you would put "64800.0" after "DinoLifetimeMin=" and "86400.0" after "DinoLifetimeMax=".

It should look something like this:


There are a plethora of other mod settings that you can change and nevcariel has done a pretty good job of listing and explaining them in this discussion. I really hope this information was helpful. Good luck, and happy arking!