i buy a server but i cant change the stacking ammount cuz the page doesnt show me the option to edit the file game.ini only shows me a blank txt that i can add some word at the end of the file, pls help :( i cant use mods cuz my friends play in epic

You just add what you want to the ini via the expert tab.

Like this:
ConfigOverrideItemMaxQuantity=(ItemClassString="PrimalItemResource_Crystal_C",Quantity=(MaxItemQuantity=1000,bIgnoreMultiplier=true))

Make sure you have the heading entry at the top:
[/script/shootergame.shootergamemode]

I have an epic games server here, and my expert tab is around 1.5 million characters long.

It just takes a lot of work.

Also:
Anything you add on the Expert tab is added at the end of the file, so be VERY careful not to use any option on the Basic or Advanced tabs, or it will cause conflicts.

thanks, where i cand find the names? or i just add the "PrimalItemResource_(name of the source)_C"

Check the gamepedia page. It's pretty complete.

https://ark.fandom.com/wiki/ARK_Survival_Evolved_Wiki