How Decrypted on Mac?

Hello I installed a rom which is cia but when I installed it it asked me to decrypt it I went to see tutorials but they were all for PC and not for Mac so I would like to know how to do it.

It doesn’t matter if you have a PC or Mac. If you dumped the game correctly with the latest GodMode9 or threeSD it will already be decrypted and ready to use for Citra. There’s no need for any other PC tools.