The "Mod Option" button?

[Ironfists]

Is there a way to use it?

[Syndaryl]

Yes, as you'll see that Frex forge has some mod options

 

You'll need a config gui, and a configuration handler to put your own config options in.

 

You can find mine here on GitHub:

https://github.com/Syndaryl/UtilityBlocks/tree/master/src/main/java/org/syndaryl/animalsdropbones/handler

[Ironfists]

Ok nice, do you have to do something special with them? Because I don't see the "config" button in the game

[Ironfists]

Fixed it, I had to make an mcmod.info file