Anyone under the age of 13 cannot use Discord per our Terms of Service. If a server owner is aware and ignores it, we will take action on the server and/or owner. I think that’s fair, taking into considering how much adult content is on the platform.
The easiest way to report someone on Discord is to simply tell a moderator of the server that the inappropriate behavior occurred in. If you want to report something to Discord’s own Trust & Safety team, you’ll need to turn on the app’s Developer Mode.