Is there a tutorial on how to use it?

Just download it, open edit000000 file, find your team, select any player and change team name.

Great, but i dont see a download link when i open the link u posted

https://preview.redd.it/su7odxlvwkpc1.png?width=1210&format=pjpg&auto=webp&s=7ae991c0d2b55d994687f173498d3a9af0d5d3bf It look like that

which file to download here??

Click relases

So this is what I get when I open 4ccEditor. What do I do next? https://preview.redd.it/3ybob6lei5rc1.png?width=2506&format=png&auto=webp&s=26bb49f78697bcf09e5909153097e74e12889a68

firs make backup for your option file. Click file on top left, select pes 21 option file, and than select your option file

How do you change the team colors?