Modmail.

It goes to the entire mod team, that's always better than private messages to the mods.

On open subs there's a button for it, if the sub is private it should still work by using:

    https://www.reddit.com/message/compose?to=/r/YourSubName

Tho I strongly suggest you ask in Discord, many mods are being "spammed" currently by users asking the same, I would consider it courtesy to ask in Discord first since it's available.

there is already a guilty gear community here, but unfortunately not that active yet. Feel free to join and contribute :) https://kbin.social/m/GuiltyGear